| 0 | N/A | N/A | IN PROGRAMMING APIS (NOT IN COMMUNICATION BETWEEN HOSTS), REQUESTS A SYSTEM-ALLOCATED (DYNAMIC) PORT[7][8] | N/A |
| 0 | RESERVED | RESERVED | RESERVED | OFFICIAL |
| 1 | TCP | ASSIGNED | TCP PORT SERVICE MULTIPLEXER(TCPMUX). HISTORIC. BOTH TCP AND UDP HAVE BEEN ASSIGNED TO TCPMUX BY IANA,[5] BUT BY DESIGN ONLY TCP IS SPECIFIED.[9] | OFFICIAL |
| 4 | RESERVED | RESERVED | UNASSIGNED | OFFICIAL |
| 5 | TCP | UDP | REMOTE JOB ENTRY | OFFICIAL |
| 6 | RESERVED | RESERVED | UNASSIGNED | OFFICIAL |
| 7 | TCP | UDP | ECHO PROTOCOL[10][11] | OFFICIAL |
| 8 | RESERVED | RESERVED | UNASSIGNED | OFFICIAL |
| 9 |
| UDP | DISCARD PROTOCOL[13] | OFFICIAL |
| 9 | | UDP | WAKE-ON-LAN[14] | UNOFFICIAL |
| 10 | RESERVED | RESERVED | UNASSIGNED | OFFICIAL |
| 11 | TCP | UDP | ACTIVE USERS (SYSTAT SERVICE)[15][16] | OFFICIAL |
| 12 | RESERVED | RESERVED | UNASSIGNED | OFFICIAL |
| 13 | TCP | UDP | DAYTIME PROTOCOL[17] | OFFICIAL |
| 14 | RESERVED | RESERVED | UNASSIGNED | OFFICIAL |
| 15 | TCP | UDP | PREVIOUSLY NETSTAT SERVICE[5][15] | UNOFFICIAL |
| 16 | RESERVED | RESERVED | UNASSIGNED | OFFICIAL |
| 17 | TCP | UDP | QUOTE OF THE DAY (QOTD)[18] | OFFICIAL |
| 18 | TCP | UDP | MESSAGE SEND PROTOCOL[19][20] | OFFICIAL |
| 19 | TCP | UDP | CHARACTER GENERATOR PROTOCOL(CHARGEN)[21] | OFFICIAL |
| 20 |
| ASSIGNED | FILE TRANSFER PROTOCOL (FTP) DATA TRANSFER[11] | OFFICIAL |
| 21 |
| ASSIGNED | FILE TRANSFER PROTOCOL (FTP) CONTROL (COMMAND)[11][12][22][23] | OFFICIAL |
| 22 |
| UDP | SECURE SHELL (SSH),[11] SECURE LOGINS, FILE TRANSFERS (SCP, SFTP) AND PORT FORWARDING | OFFICIAL |
| 23 | TCP | ASSIGNED | TELNET PROTOCOL—UNENCRYPTED TEXT COMMUNICATIONS[11][24] | OFFICIAL |
| 25 | TCP | ASSIGNED | SIMPLE MAIL TRANSFER PROTOCOL(SMTP),[11][25] USED FOR EMAIL ROUTING BETWEEN MAIL SERVERS | OFFICIAL |
| 26 | RESERVED | RESERVED | UNASSIGNED | OFFICIAL |
| 37 | TCP | UDP | TIME PROTOCOL[26] | OFFICIAL |
| 38 | TCP | UDP | ROUTE ACCESS PROTOCOL (RAP)[27][IMPORTANCE?] | OFFICIAL |
| 39 | TCP | UDP | RESOURCE LOCATION PROTOCOL(RLP)[28][IMPORTANCE?]—USED FOR DETERMINING THE LOCATION OF HIGHER LEVEL SERVICES FROM HOSTSON A NETWORK | OFFICIAL |
| 40 | RESERVED | RESERVED | UNASSIGNED | OFFICIAL |
| 42 | TCP | UDP | HOST NAME SERVER PROTOCOL[29] | OFFICIAL |
| 43 | TCP | UDP | WHOIS PROTOCOL[30][31][32] | OFFICIAL |
| 49 | TCP | UDP | TACACS+ LOGIN HOST PROTOCOL[33][NEEDS UPDATE?] | OFFICIAL |
| 50 | TCP | UDP | REMOTE MAIL CHECKING PROTOCOL[34][IMPORTANCE?] | OFFICIAL |
| 51 | | | RESERVED | OFFICIAL |
| 51 | TCP | UDP | PREVIOUSLY INTERFACE MESSAGE PROCESSOR LOGICAL ADDRESS MANAGEMENT[CITATION NEEDED] | UNOFFICIAL |
| 52 | TCP | UDP | XEROX NETWORK SYSTEMS (XNS) TIME PROTOCOL[IMPORTANCE?] | OFFICIAL |
| 53 | TCP | UDP | DOMAIN NAME SYSTEM (DNS)[11] | OFFICIAL |
| 54 | TCP | UDP | XEROX NETWORK SYSTEMS (XNS) CLEARINGHOUSE[IMPORTANCE?] | OFFICIAL |
| 56 | TCP | UDP | XEROX NETWORK SYSTEMS (XNS) AUTHENTICATION[IMPORTANCE?] | OFFICIAL |
| 57 | TCP | UDP | ANY PRIVATE TERMINAL ACCESS[FURTHER EXPLANATION NEEDED] | OFFICIAL |
| 58 | TCP | UDP | XEROX NETWORK SYSTEMS (XNS) MAIL[IMPORTANCE?] | OFFICIAL |
| 67 | ASSIGNED | UDP | BOOTSTRAP PROTOCOL (BOOTP) SERVER;[11] ALSO USED BY DYNAMIC HOST CONFIGURATION PROTOCOL(DHCP) | OFFICIAL |
| 68 | ASSIGNED | UDP | BOOTSTRAP PROTOCOL (BOOTP) CLIENT;[11] ALSO USED BY DYNAMIC HOST CONFIGURATION PROTOCOL (DHCP) | OFFICIAL |
| 69 | ASSIGNED | UDP | TRIVIAL FILE TRANSFER PROTOCOL(TFTP)[11][35][36][37] | OFFICIAL |
| 70 | TCP | UDP | GOPHER PROTOCOL[38] | OFFICIAL |
| 71–74 | TCP | UDP | NETRJS PROTOCOL[39][40][41] | OFFICIAL |
| 75 | TCP | UDP | ANY PRIVATE DIAL OUT SERVICE[FURTHER EXPLANATION NEEDED] | OFFICIAL |
| 77 | TCP | UDP | ANY PRIVATE REMOTE JOB ENTRY[FURTHER EXPLANATION NEEDED] | OFFICIAL |
| 79 | TCP | ASSIGNED | FINGER PROTOCOL[11][42][43] | OFFICIAL |
| 80 |
| UDP[44] | HYPERTEXT TRANSFER PROTOCOL(HTTP)[11][45][46][47] | OFFICIAL |
| 80 | | UDP | QUIC (FROM CHROMIUM) FOR HTTP[CITATION NEEDED] | UNOFFICIAL |
| 81 | N/A | N/A | UNASSIGNED | OFFICIAL |
| 81 | TCP | | TORPARK ONION ROUTING[VERIFICATION NEEDED] | UNOFFICIAL |
| 82 | | UDP | TORPARK CONTROL[VERIFICATION NEEDED] | UNOFFICIAL |
| 87 | | | ANY PRIVATE TERMINAL LINK[FURTHER EXPLANATION NEEDED] | OFFICIAL |
| 88 | TCP | ASSIGNED | KERBEROS[11][48][49] AUTHENTICATION SYSTEM | OFFICIAL |
| 90 | TCP | UDP | DNSIX (DOD NETWORK SECURITY FOR INFORMATION EXCHANGE) SECURIT [SIC?] ATTRIBUTE TOKEN MAP[IMPORTANCE?] | OFFICIAL |
| 90 | TCP | UDP | POINTCAST (DOTCOM)[5][THIRD-PARTY SOURCE NEEDED] | UNOFFICIAL |
| 99 | TCP | | WIP MESSAGE PROTOCOL[VERIFICATION NEEDED] | UNOFFICIAL |
| 100 | N/A | N/A | UNASSIGNED (WITH KNOWN UNAUTHORIZED USE[FURTHER EXPLANATION NEEDED])[5] | OFFICIAL |
| 101 | TCP | UDP | NIC HOST NAME | OFFICIAL |
| 102 | TCP | UDP | ISO TRANSPORT SERVICE ACCESS POINT (TSAP) CLASS 0 PROTOCOL;[50][51] | OFFICIAL |
| 104 | TCP | UDP | DIGITAL IMAGING AND COMMUNICATIONS IN MEDICINE(DICOM; ALSO PORT 11112) | OFFICIAL |
| 105 | TCP | UDP | CCSO NAMESERVER[52] | OFFICIAL |
| 107 | TCP | UDP | REMOTE USER TELNET SERVICE(RTELNET)[53] | OFFICIAL |
| 108 | TCP | UDP | IBM SYSTEMS NETWORK ARCHITECTURE (SNA) GATEWAY ACCESS SERVER | OFFICIAL |
| 109 | TCP | UDP | POST OFFICE PROTOCOL, VERSION 2 (POP2)[54] | OFFICIAL |
| 110 | TCP | ASSIGNED | POST OFFICE PROTOCOL, VERSION 3 (POP3)[11][55][56] | OFFICIAL |
| 111 | TCP | UDP | OPEN NETWORK COMPUTING REMOTE PROCEDURE CALL (ONC RPC, SOMETIMES REFERRED TO AS SUN RPC) | OFFICIAL |
| 112 | TCP | | VIRTUAL ROUTER REDUNDANCY PROTOCOL (VRRP)[57][UNRELIABLE SOURCE?] | UNOFFICIAL |
| 113 | TCP | | IDENT, AUTHENTICATION SERVICE/IDENTIFICATION PROTOCOL,[11][58] USED BY IRC SERVERS TO IDENTIFY USERS | OFFICIAL |
| 113 | TCP | ASSIGNED | AUTHENTICATION SERVICE (AUTH), THE PREDECESSOR TO IDENTIFICATION PROTOCOL. USED TO DETERMINE A USER’S IDENTITY OF A PARTICULAR TCP CONNECTION.[59] | OFFICIAL |
| 114 | N/A | N/A | UNASSIGNED (DEPRECATED SINCE JUNE 2004)[5] | OFFICIAL |
| 115 | TCP | UDP | SIMPLE FILE TRANSFER PROTOCOL[11][60] | OFFICIAL |
| 117 | TCP | UDP | UUCP MAPPING PROJECT (PATH SERVICE)[CITATION NEEDED] | OFFICIAL |
| 118 | TCP | UDP | STRUCTURED QUERY LANGUAGE (SQL) SERVICES[JARGON] | OFFICIAL |
| 119 | TCP | ASSIGNED | NETWORK NEWS TRANSFER PROTOCOL (NNTP),[11] RETRIEVAL OF NEWSGROUP MESSAGES[61][62] | OFFICIAL |
| 123 | ASSIGNED | UDP | NETWORK TIME PROTOCOL (NTP), USED FOR TIME SYNCHRONIZATION[11] | OFFICIAL |
| 126 | TCP | UDP | FORMERLY UNISYS UNITARY LOGIN, RENAMED BY UNISYS TO NXEDIT. USED BY UNISYS PROGRAMMER’S WORKBENCH FOR CLEARPATH MCP, AN IDE FOR UNISYS MCP SOFTWARE DEVELOPMENT | OFFICIAL |
| 135 | TCP | UDP | DCE ENDPOINT RESOLUTION | OFFICIAL |
| 135 | TCP | UDP | MICROSOFT EPMAP (END POINT MAPPER), ALSO KNOWN AS DCE/RPCLOCATOR SERVICE,[63] USED TO REMOTELY MANAGE SERVICES INCLUDING DHCP SERVER, DNSSERVER AND WINS. ALSO USED BY DCOM | OFFICIAL |
| 137 | ASSIGNED | UDP | NETBIOS NAME SERVICE, USED FOR NAME REGISTRATION AND RESOLUTION[64][65] | OFFICIAL |
| 138 | TCP | UDP | NETBIOS DATAGRAM SERVICE[11][64][65] | OFFICIAL |
| 139 | TCP | ASSIGNED | NETBIOS SESSION SERVICE[64][65] | OFFICIAL |
| 143 | TCP | ASSIGNED | INTERNET MESSAGE ACCESS PROTOCOL (IMAP),[11] MANAGEMENT OF ELECTRONIC MAIL MESSAGES ON A SERVER[66] | OFFICIAL |
| 152 | TCP | UDP | BACKGROUND FILE TRANSFER PROGRAM (BFTP)[67][IMPORTANCE?] | OFFICIAL |
| 153 | TCP | UDP | SIMPLE GATEWAY MONITORING PROTOCOL (SGMP), A PROTOCOL FOR REMOTE INSPECTION AND ALTERATION OF GATEWAY MANAGEMENT INFORMATION[68] | OFFICIAL |
| 156 | TCP | UDP | STRUCTURED QUERY LANGUAGE (SQL) SERVICE[JARGON] | OFFICIAL |
| 158 | TCP | UDP | DISTRIBUTED MAIL SYSTEM PROTOCOL (DMSP, SOMETIMES REFERRED TO AS PCMAIL)[69][IMPORTANCE?] | OFFICIAL |
| 161 | ASSIGNED | UDP | SIMPLE NETWORK MANAGEMENT PROTOCOL (SNMP)[70][CITATION NEEDED][11] | OFFICIAL |
| 162 | TCP | UDP | SIMPLE NETWORK MANAGEMENT PROTOCOL TRAP (SNMPTRAP)[70][71][CITATION NEEDED] | OFFICIAL |
| 170 | TCP | UDP | PRINT SERVER[VERIFICATION NEEDED] | OFFICIAL |
| 177 | TCP | UDP | X DISPLAY MANAGER CONTROL PROTOCOL (XDMCP), USED FOR REMOTE LOGINS TO AN X DISPLAY MANAGER SERVER[72] | OFFICIAL |
| 179 |
| UDP | BORDER GATEWAY PROTOCOL (BGP),[73] USED TO EXCHANGE ROUTING AND REACHABILITY INFORMATION AMONG AUTONOMOUS SYSTEMS (AS) ON THE INTERNET | OFFICIAL |
| 194 | TCP | UDP | INTERNET RELAY CHAT (IRC)[74] | OFFICIAL |
| 199 | TCP | UDP | SNMP MULTIPLEXING PROTOCOL (SMUX)[75][76][IMPORTANCE?] | OFFICIAL |
| 201 | TCP | UDP | APPLETALK ROUTING MAINTENANCE | OFFICIAL |
| 209 | TCP | UDP | QUICK MAIL TRANSFER PROTOCOL | OFFICIAL |
| 210 | TCP | UDP | ANSI Z39.50 | OFFICIAL |
| 213 | TCP | UDP | INTERNETWORK PACKET EXCHANGE(IPX) | OFFICIAL |
| 218 | TCP | UDP | MESSAGE POSTING PROTOCOL (MPP) | OFFICIAL |
| 220 | TCP | UDP | INTERNET MESSAGE ACCESS PROTOCOL (IMAP), VERSION 3 | OFFICIAL |
| 259 | TCP | UDP | EFFICIENT SHORT REMOTE OPERATIONS (ESRO) | OFFICIAL |
| 262 | TCP | UDP | ARCISDMS | OFFICIAL |
| 264 | TCP | UDP | BORDER GATEWAY MULTICAST PROTOCOL (BGMP) | OFFICIAL |
| 280 | TCP | UDP | HTTP-MGMT | OFFICIAL |
| 300 | TCP | | THINLINC WEB ACCESS | UNOFFICIAL |
| 308 | TCP | | NOVASTOR ONLINE BACKUP | OFFICIAL |
| 311 | TCP | | MAC OS X SERVER ADMIN[11](OFFICIALLY APPLESHARE IP WEB ADMINISTRATION[5]) | OFFICIAL |
| 318 | TCP | UDP | PKIX TIME STAMP PROTOCOL (TSP) | OFFICIAL |
| 319 | | UDP | PRECISION TIME PROTOCOL (PTP) EVENT MESSAGES | OFFICIAL |
| 320 | | UDP | PRECISION TIME PROTOCOL (PTP) GENERAL MESSAGES | OFFICIAL |
| 350 | TCP | UDP | MAPPING OF AIRLINE TRAFFIC OVER INTERNET PROTOCOL (MATIP) TYPE A | OFFICIAL |
| 351 | TCP | UDP | MATIP TYPE B | OFFICIAL |
| 356 | TCP | UDP | CLOANTO-NET-1 (USED BY CLOANTO AMIGA EXPLORER AND VMS) | OFFICIAL |
| 366 | TCP | UDP | ON-DEMAND MAIL RELAY (ODMR) | OFFICIAL |
| 369 | TCP | UDP | RPC2PORTMAP | OFFICIAL |
| 370 | TCP | | CODAAUTH2, CODA AUTHENTICATION SERVER | OFFICIAL |
| 370 | | UDP | CODAAUTH2, CODA AUTHENTICATION SERVER | OFFICIAL |
| 370 | | UDP | SECURECAST1, OUTGOING PACKETS TO NAI‘S SECURECAST SERVERS[77]AS OF 2000 | OFFICIAL |
| 371 | TCP | UDP | CLEARCASE ALBD | OFFICIAL |
| 383 | TCP | UDP | HP DATA ALARM MANAGER | OFFICIAL |
| 384 | TCP | UDP | A REMOTE NETWORK SERVER SYSTEM | OFFICIAL |
| 387 | TCP | UDP | AURP (APPLETALK UPDATE-BASED ROUTING PROTOCOL)[78] | OFFICIAL |
| 389 | TCP | ASSIGNED | LIGHTWEIGHT DIRECTORY ACCESS PROTOCOL (LDAP)[11] | OFFICIAL |
| 399 | TCP | UDP | DIGITAL EQUIPMENT CORPORATIONDECNET (PHASE V+) OVER TCP/IP | OFFICIAL |
| 401 | TCP | UDP | UNINTERRUPTIBLE POWER SUPPLY(UPS) | OFFICIAL |
| 427 | TCP | UDP | SERVICE LOCATION PROTOCOL (SLP)[11] | OFFICIAL |
| 433 | TCP | UDP | NNSP, PART OF NETWORK NEWS TRANSFER PROTOCOL | OFFICIAL |
| 434 | TCP | UDP | MOBILE IP AGENT (RFC 5944) | OFFICIAL |
| 443 |
| ASSIGNED | HYPERTEXT TRANSFER PROTOCOLOVER TLS/SSL (HTTPS)[11] | OFFICIAL |
| 443 | | UDP | QUIC (FROM CHROMIUM) FOR HTTPS | UNOFFICIAL |
| 444 | TCP | UDP | SIMPLE NETWORK PAGING PROTOCOL(SNPP), RFC 1568 | OFFICIAL |
| 444 | TCP | | WELL KNOWN SLITHER.IO PORT | UNOFFICIAL |
| 445 | TCP | UDP | MICROSOFT-DS ACTIVE DIRECTORY,[79]WINDOWS SHARES | OFFICIAL |
| 445 | TCP | ASSIGNED | MICROSOFT-DS SMB[11] FILE SHARING | OFFICIAL |
| 464 | TCP | UDP | KERBEROS CHANGE/SET PASSWORD | OFFICIAL |
| 465 | TCP | | URL RENDEZVOUS DIRECTORY FOR SSM (CISCO PROTOCOL) | OFFICIAL |
| 465 | TCP | | AUTHENTICATED SMTP[11] OVER TLS/SSL (SMTPS) | UNOFFICIAL |
| 475 | TCP | UDP | TCPNETHASPSRV, ALADDIN KNOWLEDGE SYSTEMS HASP SERVICES | OFFICIAL |
| 491 | TCP | | GO-GLOBAL REMOTE ACCESS AND APPLICATION PUBLISHING SOFTWARE | UNOFFICIAL |
| 497 | TCP | UDP | RETROSPECT | OFFICIAL |
| 500 | ASSIGNED | UDP | INTERNET SECURITY ASSOCIATION AND KEY MANAGEMENT PROTOCOL(ISAKMP) / INTERNET KEY EXCHANGE(IKE)[11] | OFFICIAL |
| 502 | TCP | UDP | MODBUS PROTOCOL | OFFICIAL |
| 504 | TCP | UDP | CITADEL, MULTISERVICE PROTOCOL FOR DEDICATED CLIENTS FOR THE CITADEL GROUPWARE SYSTEM | OFFICIAL |
| 510 | TCP | UDP | FIRSTCLASS PROTOCOL (FCP), USED BY FIRSTCLASS CLIENT/SERVER GROUPWARE SYSTEM | OFFICIAL |
| 512 | TCP | | REXEC, REMOTE PROCESS EXECUTION | OFFICIAL |
| 512 | | UDP | COMSAT, TOGETHER WITH BIFF | OFFICIAL |
| 513 | TCP | | RLOGIN | OFFICIAL |
| 513 | | UDP | WHO[80] | OFFICIAL |
| 514 | TCP | | REMOTE SHELL, USED TO EXECUTE NON-INTERACTIVE COMMANDS ON A REMOTE SYSTEM (REMOTE SHELL, RSH, REMSH) | OFFICIAL |
| 514 | | UDP | SYSLOG,[11] USED FOR SYSTEM LOGGING | OFFICIAL |
| 515 | TCP | ASSIGNED | LINE PRINTER DAEMON (LPD),[11]PRINT SERVICE | OFFICIAL |
| 517 | | UDP | TALK | OFFICIAL |
| 518 | | UDP | NTALK | OFFICIAL |
| 520 | TCP | | EFS, EXTENDED FILE NAME SERVER | OFFICIAL |
| 520 | | UDP | ROUTING INFORMATION PROTOCOL(RIP) | OFFICIAL |
| 521 | | UDP | ROUTING INFORMATION PROTOCOL NEXT GENERATION (RIPNG) | OFFICIAL |
| 524 | TCP | UDP | NETWARE CORE PROTOCOL (NCP) IS USED FOR A VARIETY THINGS SUCH AS ACCESS TO PRIMARY NETWARE SERVER RESOURCES, TIME SYNCHRONIZATION, ETC. | OFFICIAL |
| 525 | | UDP | TIMED, TIMESERVER | OFFICIAL |
| 530 | TCP | UDP | REMOTE PROCEDURE CALL (RPC) | OFFICIAL |
| 531 | TCP | UDP | AOL INSTANT MESSENGER | UNOFFICIAL |
| 532 | TCP | ASSIGNED | NETNEWS[11] | OFFICIAL |
| 533 | | UDP | NETWALL, FOR EMERGENCY BROADCASTS | OFFICIAL |
| 540 | TCP | | UNIX-TO-UNIX COPY PROTOCOL (UUCP) | OFFICIAL |
| 542 | TCP | UDP | COMMERCE (COMMERCE APPLICATIONS) | OFFICIAL |
| 543 | TCP | | KLOGIN, KERBEROS LOGIN | OFFICIAL |
| 544 | TCP | | KSHELL, KERBEROS REMOTE SHELL | OFFICIAL |
| 546 | TCP | UDP | DHCPV6 CLIENT | OFFICIAL |
| 547 | TCP | UDP | DHCPV6 SERVER | OFFICIAL |
| 548 | TCP | ASSIGNED | APPLE FILING PROTOCOL (AFP) OVER TCP[11] | OFFICIAL |
| 550 | TCP | UDP | NEW-RWHO, NEW-WHO[80] | OFFICIAL |
| 554 | TCP | UDP | REAL TIME STREAMING PROTOCOL(RTSP)[11] | OFFICIAL |
| 556 | TCP | | REMOTEFS, RFS, RFS_SERVER | OFFICIAL |
| 560 | | UDP | RMONITOR, REMOTE MONITOR | OFFICIAL |
| 561 | | UDP | MONITOR | OFFICIAL |
| 563 | TCP | UDP | NNTP OVER TLS/SSL (NNTPS) | OFFICIAL |
| 564 | TCP | | 9P (PLAN 9) | UNOFFICIAL |
| 585 | N/A | N/A | DE-REGISTERED SINCE APRIL 2006 (WITH RECOMMENDATION TO USE PORT 993 INSTEAD)[5] | OFFICIAL |
| 585 | TCP | ? | LEGACY USE OF INTERNET MESSAGE ACCESS PROTOCOL OVER TLS/SSL(IMAPS)[81] | UNOFFICIAL |
| 587 | TCP | ASSIGNED | EMAIL MESSAGE SUBMISSION[82](SMTP) | OFFICIAL |
| 591 | TCP | | FILEMAKER 6.0 (AND LATER) WEB SHARING (HTTP ALTERNATE, ALSO SEE PORT 80) | OFFICIAL |
| 593 | TCP | UDP | HTTP RPC EP MAP, REMOTE PROCEDURE CALL OVER HYPERTEXT TRANSFER PROTOCOL, OFTEN USED BY DISTRIBUTED COMPONENT OBJECT MODEL SERVICES AND MICROSOFT EXCHANGE SERVER | OFFICIAL |
| 601 | TCP | | RELIABLE SYSLOG SERVICE — USED FOR SYSTEM LOGGING | OFFICIAL |
| 604 | TCP | | TUNNEL PROFILE,[83] A PROTOCOL FOR BEEP PEERS TO FORM AN APPLICATION LAYER TUNNEL | OFFICIAL |
| 623 | | UDP | ASF REMOTE MANAGEMENT AND CONTROL PROTOCOL (ASF-RMCP) & IPMI REMOTE MANAGEMENT PROTOCOL | OFFICIAL |
| 625 | TCP | | OPEN DIRECTORY PROXY (ODPROXY)[11] | UNOFFICIAL |
| 631 | TCP | UDP | INTERNET PRINTING PROTOCOL (IPP)[11] | OFFICIAL |
| 631 | TCP | UDP | COMMON UNIX PRINTING SYSTEM(CUPS) ADMINISTRATION CONSOLE (EXTENSION TO IPP) | UNOFFICIAL |
| 635 | TCP | UDP | RLZ DBASE | OFFICIAL |
| 636 | TCP | UDP | LIGHTWEIGHT DIRECTORY ACCESS PROTOCOL OVER TLS/SSL (LDAPS)[11] | OFFICIAL |
| 639 | TCP | UDP | MSDP, MULTICAST SOURCE DISCOVERY PROTOCOL | OFFICIAL |
| 641 | TCP | UDP | SUPPORTSOFT NEXUS REMOTE COMMAND (CONTROL/LISTENING), A PROXY GATEWAY CONNECTING REMOTE CONTROL TRAFFIC | OFFICIAL |
| 643 | TCP | UDP | SANITY | OFFICIAL |
| 646 | TCP | UDP | LABEL DISTRIBUTION PROTOCOL(LDP), A ROUTING PROTOCOL USED IN MPLS NETWORKS | OFFICIAL |
| 647 | TCP | | DHCP FAILOVER PROTOCOL[84] | OFFICIAL |
| 648 | TCP | | REGISTRY REGISTRAR PROTOCOL (RRP)[85] | OFFICIAL |
| 651 | TCP | UDP | IEEE-MMS | OFFICIAL |
| 653 | TCP | UDP | SUPPORTSOFT NEXUS REMOTE COMMAND (DATA), A PROXY GATEWAY CONNECTING REMOTE CONTROL TRAFFIC | OFFICIAL |
| 654 | TCP | | MEDIA MANAGEMENT SYSTEM (MMS) MEDIA MANAGEMENT PROTOCOL (MMP)[86] | OFFICIAL |
| 655 | TCP | UDP | TINC VPN DAEMON | OFFICIAL |
| 657 | TCP | UDP | IBM RMC (REMOTE MONITORING AND CONTROL) PROTOCOL, USED BY SYSTEM P5 AIX INTEGRATED VIRTUALIZATION MANAGER (IVM)[87]AND HARDWARE MANAGEMENT CONSOLE TO CONNECT MANAGED LOGICAL PARTITIONS (LPAR) TO ENABLE DYNAMIC PARTITION RECONFIGURATION | OFFICIAL |
| 660 | TCP | ASSIGNED | MAC OS X SERVER ADMINISTRATION,[5] VERSION 10.4 AND EARLIER[11] | OFFICIAL |
| 666 | TCP | UDP | DOOM, FIRST ONLINE FIRST-PERSON SHOOTER | OFFICIAL |
| 666 | TCP | | AIRSERV-NG, AIRCRACK-NG‘S SERVER FOR REMOTE-CONTROLLING WIRELESS DEVICES | UNOFFICIAL |
| 674 | TCP | | APPLICATION CONFIGURATION ACCESS PROTOCOL (ACAP) | OFFICIAL |
| 688 | TCP | UDP | REALM-RUSD (APPLIANCEWARE SERVER APPLIANCE MANAGEMENT PROTOCOL) | OFFICIAL |
| 690 | TCP | UDP | VELNEO APPLICATION TRANSFER PROTOCOL (VATP) | OFFICIAL |
| 691 | TCP | | MS EXCHANGE ROUTING | OFFICIAL |
| 694 | TCP | UDP | LINUX-HA HIGH-AVAILABILITY HEARTBEAT | OFFICIAL |
| 695 | TCP | | IEEE MEDIA MANAGEMENT SYSTEM OVER SSL (IEEE-MMS-SSL)[88] | OFFICIAL |
| 698 | | UDP | OPTIMIZED LINK STATE ROUTING(OLSR) | OFFICIAL |
| 700 | TCP | | EXTENSIBLE PROVISIONING PROTOCOL (EPP), A PROTOCOL FOR COMMUNICATION BETWEEN DOMAIN NAME REGISTRIES AND REGISTRARS(RFC 5734) | OFFICIAL |
| 701 | TCP | | LINK MANAGEMENT PROTOCOL (LMP),[89] A PROTOCOL THAT RUNS BETWEEN A PAIR OF NODES AND IS USED TO MANAGE TRAFFIC ENGINEERING (TE) LINKS | OFFICIAL |
| 702 | TCP | | IRIS[90][91] (INTERNET REGISTRY INFORMATION SERVICE) OVER BEEP(BLOCKS EXTENSIBLE EXCHANGE PROTOCOL)[92] (RFC 3983) | OFFICIAL |
| 706 | TCP | | SECURE INTERNET LIVE CONFERENCING (SILC) | OFFICIAL |
| 711 | TCP | | CISCO TAG DISTRIBUTION PROTOCOL[93][94][95]—BEING REPLACED BY THE MPLS LABEL DISTRIBUTION PROTOCOL[96] | OFFICIAL |
| 712 | TCP | | TOPOLOGY BROADCAST BASED ON REVERSE-PATH FORWARDING ROUTING PROTOCOL (TBRPF; RFC 3684) | OFFICIAL |
| 749 | TCP | UDP | KERBEROS (PROTOCOL)ADMINISTRATION[11] | OFFICIAL |
| 750 | | UDP | KERBEROS-IV, KERBEROS VERSION IV | OFFICIAL |
| 751 | TCP | UDP | KERBEROS_MASTER, KERBEROSAUTHENTICATION | UNOFFICIAL |
| 752 | | UDP | PASSWD_SERVER, KERBEROSPASSWORD (KPASSWD) SERVER | UNOFFICIAL |
| 753 | TCP | | REVERSE ROUTING HEADER (RRH)[97] | OFFICIAL |
| 753 | | UDP | REVERSE ROUTING HEADER (RRH) | OFFICIAL |
| 753 | | UDP | USERREG_SERVER, KERBEROS USERREG SERVER | UNOFFICIAL |
| 754 | TCP | | TELL SEND | OFFICIAL |
| 754 | TCP | | KRB5_PROP, KERBEROS V5 SLAVE PROPAGATION | UNOFFICIAL |
| 754 | | UDP | TELL SEND | OFFICIAL |
| 760 | TCP | UDP | KRBUPDATE [KREG], KERBEROSREGISTRATION | UNOFFICIAL |
| 782 | TCP | | CONSERVER SERIAL-CONSOLE MANAGEMENT SERVER | UNOFFICIAL |
| 783 | TCP | | SPAMASSASSIN SPAMD DAEMON | UNOFFICIAL |
| 800 | TCP | UDP | MDBS-DAEMON | OFFICIAL |
| 808 | TCP | | MICROSOFT NET.TCP PORT SHARING SERVICE | UNOFFICIAL |
| 829 | TCP | | CERTIFICATE MANAGEMENT PROTOCOL[98] | UNOFFICIAL |
| 830 | TCP | UDP | NETCONF OVER SSH | OFFICIAL |
| 831 | TCP | UDP | NETCONF OVER BEEP | OFFICIAL |
| 832 | TCP | UDP | NETCONF FOR SOAP OVER HTTPS | OFFICIAL |
| 833 | TCP | UDP | NETCONF FOR SOAP OVER BEEP | OFFICIAL |
| 843 | TCP | | ADOBE FLASH[99] | UNOFFICIAL |
| 847 | TCP | | DHCP FAILOVER PROTOCOL | OFFICIAL |
| 848 | TCP | UDP | GROUP DOMAIN OF INTERPRETATION (GDOI) PROTOCOL | OFFICIAL |
| 853 | TCP | UDP | DNS OVER TLS (RFC 7858) | OFFICIAL |
| 860 | TCP | | ISCSI (RFC 3720) | OFFICIAL |
| 861 | TCP | UDP | OWAMP CONTROL (RFC 4656) | OFFICIAL |
| 862 | TCP | UDP | TWAMP CONTROL (RFC 5357) | OFFICIAL |
| 873 | TCP | | RSYNC FILE SYNCHRONIZATION PROTOCOL | OFFICIAL |
| 888 | TCP | | CDDBP, CD DATABASE (CDDB) PROTOCOL (CDDBP) | UNOFFICIAL |
| 888 | TCP | | IBM ENDPOINT MANAGER REMOTE CONTROL | UNOFFICIAL |
| 897 | TCP | UDP | BROCADE SMI-S RPC | UNOFFICIAL |
| 898 | TCP | UDP | BROCADE SMI-S RPC SSL | UNOFFICIAL |
| 902 | TCP | UDP | VMWARE ESXI[100][101] | UNOFFICIAL |
| 903 | TCP | | VMWARE ESXI[100][101] | UNOFFICIAL |
| 953 | TCP | | BIND REMOTE NAME DAEMON CONTROL (RNDC)[102][103] | OFFICIAL |
| 954–988 | N/A | N/A | UNASSIGNED | OFFICIAL |
| 981 | TCP | | REMOTE HTTPS MANAGEMENT FOR FIREWALL DEVICES RUNNING EMBEDDED CHECK POINT VPN-1SOFTWARE[104] | UNOFFICIAL |
| 987 | TCP | | MICROSOFT REMOTE WEB WORKPLACE, A FEATURE OF WINDOWS SMALL BUSINESS SERVER[105] | UNOFFICIAL |
| 989 | TCP | UDP | FTPS PROTOCOL (DATA), FTP OVER TLS/SSL | OFFICIAL |
| 990 | TCP | UDP | FTPS PROTOCOL (CONTROL), FTPOVER TLS/SSL | OFFICIAL |
| 991 | TCP | UDP | NETNEWS ADMINISTRATION SYSTEM (NAS)[106] | OFFICIAL |
| 992 | TCP | UDP | TELNET PROTOCOL OVER TLS/SSL | OFFICIAL |
| 993 | TCP | ASSIGNED | INTERNET MESSAGE ACCESS PROTOCOL OVER TLS/SSL (IMAPS)[11] | OFFICIAL |
| 994 | RESERVED | RESERVED | RESERVED | OFFICIAL |
| 994 | TCP | UDP | INTERNET RELAY CHAT OVER TLS/SSL(IRCS)[74] | UNOFFICIAL |
| 995 | TCP | UDP | POST OFFICE PROTOCOL 3 OVER TLS/SSL (POP3S)[11] | OFFICIAL |
| 999 | TCP | | SCIMOREDB DATABASE SYSTEM[107] | UNOFFICIAL |
| 1010 | TCP | | THINLINC WEB-BASED ADMINISTRATION INTERFACE[108] | UNOFFICIAL |
| 1023 | RaaESERVED | RESERVED | RESERVED[5] | OFFICIAL |
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