- Close the port if nothing on the host needs it.
- Identify the process that listens on it (commands below) before opening it in a firewall.
- Expose a service only to the networks that use it.
Other services ports
Registered services that fit no other category. 4,970 ports, most common first.
| Port | Service | Transport | Risk | Encryption |
|---|---|---|---|---|
| 493 | Transport Independent Convergence for FNA ticf-2 | TCP UDP | - | - |
| 494 | POV-Ray pov-ray | TCP UDP | - | - |
| 495 | intecourier intecourier | TCP UDP | - | - |
| 496 | PIM-RP-DISC pim-rp-disc | TCP UDP | - | - |
| 498 | siam siam | TCP UDP | - | - |
| 499 | ISO ILL Protocol iso-ill | TCP UDP | - | - |
| 501 | STMF stmf | TCP UDP | - | - |
| 503 | Intrinsa intrinsa | TCP UDP | - | - |
| 504 | citadel citadel | TCP UDP | - | - |
| 505 | mailbox-lm mailbox-lm | TCP UDP | - | - |
| 506 | ohimsrv ohimsrv | TCP UDP | - | - |
| 507 | crs crs | TCP UDP | - | - |
| 508 | xvttp xvttp | TCP UDP | - | - |
| 509 | snare snare | TCP UDP | - | - |
| 510 | FirstClass Protocol fcp | TCP UDP | - | - |
| 511 | PassGo passgo | TCP UDP | - | - |
| 516 | videotex videotex | TCP UDP | - | - |
| 517 | like tenex link, but across machine - unfortunately, doesn't use link protocol (this is actually just a rendezvous port from which a tcp connection is established) talk | TCP UDP | - | - |
| 518 | ntalk | TCP UDP | - | - |
| 519 | unixtime utime | TCP UDP | - | - |
| 520 | extended file name server efs, router | TCP UDP | - | - |
| 521 | ripng ripng | TCP UDP | - | - |
| 522 | ULP ulp | TCP UDP | - | - |
| 524 | NCP ncp | TCP UDP | - | - |
| 525 | timeserver timed | TCP UDP | - | - |
| 526 | newdate tempo | TCP UDP | - | - |
| 527 | Stock IXChange stx | TCP UDP | - | - |
| 528 | Customer IXChange custix | TCP UDP | - | - |
| 532 | readnews netnews | TCP UDP | - | - |
| 533 | for emergency broadcasts netwall | TCP UDP | - | - |
| 534 | windream Admin windream | TCP UDP | - | - |
| 535 | iiop iiop | TCP UDP | - | - |
| 536 | opalis-rdv opalis-rdv | TCP UDP | - | - |
| 538 | gdomap gdomap | TCP UDP | - | - |
| 539 | Apertus Technologies Load Determination apertus-ldp | TCP UDP | - | - |
| 540 | uucpd uucp | TCP UDP | - | - |
| 542 | commerce commerce | TCP UDP | - | - |
| 543 | klogin | TCP UDP | - | - |
| 544 | krcmd kshell | TCP UDP | - | - |
| 545 | appleqtcsrvr appleqtcsrvr | TCP UDP | - | - |
| 546 | DHCPv6 Client dhcpv6-client | TCP UDP | - | - |
| 547 | DHCPv6 Server dhcpv6-server | TCP UDP | - | - |
| 549 | IDFP idfp | TCP UDP | - | - |
| 550 | new-who new-rwho | TCP UDP | - | - |
| 551 | cybercash cybercash | TCP UDP | - | - |
| 552 | DeviceShare devshr-nts | TCP UDP | - | - |
| 553 | pirp pirp | TCP UDP | - | - |
| 555 | dsf | TCP UDP | - | - |
| 556 | rfs server remotefs | TCP UDP | - | - |
| 557 | openvms-sysipc openvms-sysipc | TCP UDP | - | - |
| 558 | SDNSKMP sdnskmp | TCP UDP | - | - |
| 559 | TEEDTAP teedtap | TCP UDP | - | - |
| 560 | rmonitord rmonitor | TCP UDP | - | - |
| 562 | chcmd chshell | TCP UDP | - | - |
| 565 | whoami whoami | TCP UDP | - | - |
| 566 | streettalk streettalk | TCP UDP | - | - |
| 568 | microsoft shuttle ms-shuttle | TCP UDP | - | - |
| 569 | microsoft rome ms-rome | TCP UDP | - | - |
| 570 | demon meter | TCP UDP | - | - |
| 571 | udemon meter | TCP UDP | - | - |
| 572 | sonar sonar | TCP UDP | - | - |
| 573 | banyan-vip banyan-vip | TCP UDP | - | - |
| 575 | VEMMI vemmi | TCP UDP | - | - |
| 576 | ipcd ipcd | TCP UDP | - | - |
| 577 | vnas vnas | TCP UDP | - | - |
| 578 | ipdd ipdd | TCP UDP | - | - |
| 579 | decbsrv decbsrv | TCP UDP | - | - |
| 580 | SNTP HEARTBEAT sntp-heartbeat | TCP UDP | - | - |
| 582 | SCC Security scc-security | TCP UDP | - | - |
| 584 | Key Server keyserver | TCP UDP | - | - |
| 588 | CAL cal | TCP UDP | - | - |
| 589 | EyeLink eyelink | TCP UDP | - | - |
| 590 | TNS CML tns-cml | TCP UDP | - | - |
| 592 | Eudora Set eudora-set | TCP UDP | - | - |
| 594 | TPIP tpip | TCP UDP | - | - |
| 595 | CAB Protocol cab-protocol | TCP UDP | - | - |
| 596 | SMSD smsd | TCP UDP | - | - |
| 597 | PTC Name Service ptcnameservice | TCP UDP | - | - |
| 599 | Aeolon Core Protocol acp | TCP UDP | - | - |
| 600 | Sun IPC server ipcserver | TCP UDP | - | - |
| 603 | IDXP idxp | TCP UDP | - | - |
| 606 | Cray Unified Resource Manager urm | TCP UDP | - | - |
| 607 | nqs nqs | TCP UDP | - | - |
| 610 | npmp-local npmp-local | TCP UDP | - | - |
| 611 | npmp-gui npmp-gui | TCP UDP | - | - |
| 612 | HMMP Indication hmmp-ind | TCP UDP | - | - |
| 613 | HMMP Operation hmmp-op | TCP UDP | - | - |
| 614 | SSLshell sshell | TCP UDP | - | - |
| 615 | Internet Configuration Manager sco-inetmgr | TCP UDP | - | - |
| 616 | SCO System Administration Server sco-sysmgr | TCP UDP | - | - |
| 617 | SCO Desktop Administration Server sco-dtmgr | TCP UDP | - | - |
| 618 | DEI-ICDA dei-icda | TCP UDP | - | - |
| 619 | Compaq EVM compaq-evm | TCP UDP | - | - |
| 620 | SCO WebServer Manager sco-websrvrmgr | TCP UDP | - | - |
| 621 | ESCP escp-ip | TCP UDP | - | - |
| 622 | Collaborator collaborator | TCP UDP | - | - |
| 623 | ASF Remote Management and Control Protocol asf-rmcp, oob-ws-http | UDP TCP | - | - |
| 624 | Crypto Admin cryptoadmin | TCP UDP | - | - |
| 625 | DEC DLM dec_dlm, dec-dlm | TCP UDP | - | - |
| 626 | ASIA asia | TCP UDP | - | - |
Securing other services services
Other port categories
Web /tools/ports/category/web Remote access /tools/ports/category/remote-access File transfer & sharing /tools/ports/category/file-transfer Email /tools/ports/category/email Databases & caches /tools/ports/category/databases Directory & authentication /tools/ports/category/directory-auth Network services /tools/ports/category/network-services VPN, tunnels & proxies /tools/ports/category/vpn-tunnels Messaging & queues /tools/ports/category/messaging Voice & chat /tools/ports/category/voice-chat Media & streaming /tools/ports/category/media IoT & industrial (ICS) /tools/ports/category/iot-ics DevOps, cloud & containers /tools/ports/category/devops Monitoring & logging /tools/ports/category/monitoring Gaming /tools/ports/category/gaming