Mike's PBX Cookbook

Well-Known TCP/UDP Ports

When scanning, check for the following open ports: portscan.png


Port # Protocol Description Status
0 TCP, UDP Reserved; do not use (but is a permissible source port value if the sending process does not expect messages in response)
1 TCP, UDP TCPMUX
5 TCP, UDP RJE (Remote Job Entry)
7 TCP, UDP ECHO protocol
9 TCP, UDP DISCARD protocol / Wale-on-LAN (unofficial)
11 TCP, UDP SYSTAT protocol
13 TCP, UDP DAYTIME protocol
17 TCP, UDP QOTD (Quote of the Day) protocol
18 TCP, UDP Message Send Protocol
19 TCP, UDP CHARGEN (Character Generator) protocol
20 TCP FTP Protocol (data) - port for transferring FTP data
21 TCP FTP Protocol (control) - port for FTP commands and flow control
22 TCP, UDP SSH (Secure Shell) - used for secure logins, file transfers (scp, sftp) and port forwarding
23 TCP, UDP Telnet protocol - unencrypted text communication, remote login service
25 TCP, UDP SMTP (Simple Mail Transport Protocol) - used for email routing between email servers
26 TCP, UDP RSFTP - A simple FTP-like protocol
35 TCP, UDP QMS Magicolor 2 printer
37 TCP, UDP TIME protocol
38 TCP, UDP RAP (Route Access Protocol)
39 TCP, UDP RLP (Resource Location Protocol)
41 TCP, UDP Graphics
42 TCP, UDP Host Name Server/WINS Replications
43 TCP WHOIS protocol
49 TCP, UDP TACACS Login Host protocol
53 TCP, UDP DNS (Domain Name System)
57 TCP MTP, Mail Transfer Protocol
67 UDP BOOTP (BootStrap Protocol) server; also used by DHCP
68 UDP BOOTP (BootStrap Protocol) client; also used by DHCP
69 UDP TFTP (Trivial File Transfer Protocol)
70 TCP Gopher protocol
79 TCP Finger protocol
80 TCP HTTP (HyperText Transfer Protocol) - used for transferring web pages
81 TCP Torpark - Onion routing ORport
82 UDP Torpark - Control Port
88 TCP Kerberos - authenticating agent
101 TCP HOSTNAME  
102 TCP ISO-TSAP protocol/Microsoft Exchange  
107 TCP Remote Telnet Service  
109 TCP POP, Post Office Protocol, version 2  
110 TCP POP3 (Post Office Protocol version 3) - used for retrieving emails
111 TCP, UDP SUNRPC protocol  
113 TCP Ident - old server identification system, still used by IRC servers to identify its users
115 TCP SFTP, Simple File Transfer Protocol  
117 TCP UUCP-PATH  
118 TCP, UDP SQL Services
119 TCP NNTP (Network News Transfer Protocol) - used for retrieving newsgroups messages
123 UDP NTP (Network Time Protocol) - used for time synchronization
135 TCP, UDP EPMAP / Microsoft RPC Locator Service
137 TCP, UDP NetBIOS NetBIOS Name Service
138 TCP, UDP NetBIOS NetBIOS Datagram Service
139 TCP, UDP NetBIOS NetBIOS Session Service
143 TCP, UDP IMAP4 (Internet Message Access Protocol 4) - used for retrieving emails
152 TCP, UDP BFTP, Background File Transfer Program  
153 TCP, UDP SGMP, Simple Gateway Monitoring Protocol  
156 TCP, UDP SQL Service
157 TCP, UDP KNET VM Command Message Protocol  
158 TCP, UDP DMSP, Distributed Mail Service Protocol  
159 TCP, UDP NSS-Routing  
160 TCP, UDP SGMP-TRAPS  
161 TCP, UDP SNMP (Simple Network Management Protocol)
162 TCP, UDP SNMPTRAP
170 TCP Print-srv  
179 TCP BGP (Border Gateway Protocol) - an exterior gateway routing protocol that enables groups of routers to share routing information to ensure efficient and loop-free routes can be established. BGP is commonly used within and between ISPs.
190 TCP, UDP Gateway Access Control Protocol (GACP)  
191 TCP, UDP Prospero Directory Service  
192 TCP, UDP OSU Network Monitoring System, Apple AirPort Base Station PPP status or discovery, AirPort Admin Utility or Express Assistant  
192 TCP. UDP SRMP (Spider Remote Monitoring Protocol)  
194 TCP IRC (Internet Relay Chat)
201 TCP, UDP AppleTalk Routing Maintenance  
209 TCP, UDP The Quick Mail Transfer Protocol  
213 TCP, UDP IPX
218 TCP, UDP MPP, Message Posting Protocol  
220 TCP, UDP IMAP, Interactive Mail AccessProtocol, version 3  
259 TCP, UDP ESRO, Efficient Short Remote Operations  
264 TCP, UDP BGMP, Border Gateway Multicast Protocol  
311 TCP Apple Server-Admin-Tool, Workgroup-Manager-Tool  
318 TCP, UDP TSP, Time Stamp Protocol  
323 TCP, UDP IMMP, Internet Message Mapping Protocol  
366 TCP, UDP SMTP, Simple Mail Transfer Protocol. On-Demand Mail Relay (ODMR)  
369 TCP, UDP Rpc2portmap
371 TCP, UDP ClearCase albd
383 TCP, UDP HP OpenView HTTPs Operations Agent  
384 TCP, UDP A Remote Network Server System  
387 TCP, UDP AURP, AppleTalk Update-Based Routing Protocol  
389 TCP, UDP LDAP (Lightweight Directory Access Protocol)
401 TCP, UDP UPS Uninterruptible Power Supply
411 TCP Direct Connect Hub port
427 TCP, UDP SLP (Service Location Protocol)
443 TCP HTTPS - HTTP Protocol over TLS/SSL (used for transferring web pages securely using encryption)
444 TCP, UDP SNPP, Simple Network Paging Protocol  
445 TCP Microsoft-DS (Active Directory, Windows shares, Sasser worm, Agobot, Zobotworm)
445 UDP Microsoft-DS SMB file sharing
464 TCP, UDP Kerberos Change/Set password
465 TCP SMTP over SSL - CONFLICT with registered Cisco protocol
500 TCP, UDP ISAKMP, IKE-Internet Key Exchange
512 TCP exec, Remote Process Execution  
512 UDP comsat, together with biff: notifies users of new c.q. yet unread e-mail  
513 TCP Login  
513 UDP Who  
514 TCP rsh protocol - used to execute non-interactive commandline commands on a remote system and see the screen return  
514 UDP syslog protocol - used for system logging
515 TCP Line Printer Daemon protocol - used in LPD printer servers  
517 TCP Talk  
518 UDP NTalk  
520 TCP efs  
520 UDP Routing - RIP
513 UDP Router  
524 TCP, UDP NCP (NetWare Core Protocol) is used for a variety things such as access to primary NetWare server resources, Time Synchronization, etc.
525 UDP Timed, Timeserver  
530 TCP, UDP RPC
531 TCP, UDP AOL Instant Messenger, IRC  
532 TCP netnews  
533 UDP netwall, For Emergency Broadcasts  
540 TCP UUCP (Unix-to-Unix Copy Protocol)  
542 TCP, UDP commerce (Commerce Applications)  
543 TCP klogin, Kerberos login  
544 TCP kshell, Kerberos Remote Shell  
546 TCP, UDP DHCPv6 client  
547 TCP, UDP DHCPv6 server  
548 TCP AFP (Apple Filing Protocol)  
550 UDP new-rwho, new-who  
554 TCP, UDP RTSP (Real Time Streaming Protocol)
556 TCP Remotefs, rfs, rfs_server  
560 UDP rmonitor, Remote Monitor  
561 UDP monitor  
561 TCP, UDP chcmd  
563 TCP, UDP NNTP protocol over TLS/SSL (NNTPS)
587 TCP Email message submission (SMTP) (RFC 2476)
591 TCP FileMaker 6.0 Web Sharing (HTTP Alternate, see port 80)
593 TCP, UDP HTTP RPC Ep Map/Microsoft DCOM
604 TCP TUNNEL  
631 TCP, UDP IPP, Internet Printing Protocol  
636 TCP, UDP LDAP over SSL (encrypted transmission)
639 TCP, UDP MSDP, Multicast Source Discovery Protocol  
646 TCP LDP, Label Distribution Protocol  
647 TCP DHCP Failover Protocol  
648 TCP RRP, Registry Registrar Protocol  
652 TCP DTCP, Dynamic Tunnel Configuration Protocol  
654 TCP AODV, Ad hoc On-Demand Distance Vector  
665 TCP sun-dr, Remote Dynamic Reconfiguration
666 UDP Doom, First online FPS  
674 TCP ACAP, Application Configuration Access Protocol  
691 TCP Microsoft Exchange Routing
692 TCP Hyperwave-ISP  
695 TCP IEEE-MMS-SSL  
698 TCP OLSR, Optimized Link State Routing  
699 TCP Access Network  
700 TCP EPP, Extensible Provisioning Protocol  
701 TCP LMP, Link Management Protocol.  
702 TCP IRIS over BEEP  
706 TCP SILC, Secure Internet Live Conferencing  
711 TCP TDP, Tag Distribution Protocol  
712 TCP TBRPF, Topology Broadcast based on Reverse-Path Forwarding  
720 TCP SMQP, Simple Message Queue Protocol  
749 TCP, UDP kerberos-adm, Kerberos administration  
750 UDP Kerberos version IV  
782 TCP Conserver serial-console management server  
829 TCP CMP (Certificate Management Protocol)  
860 TCP iSCSI  
873 TCP rsync - File synchronisation protocol
901 TCP Samba Web Administration Tool (SWAT)
902   VMware Server
911 TCP Network Console on Acid (NCA) - local tty redirection over OpenSSH  
981 TCP SofaWare Technologies Remote HTTPS management for firewall devices running embedded Checkpoint Firewall-1 software
989 TCP, UDP FTP Protocol (data) over TLS/SSL
990 TCP, UDP FTP Protocol (control) over TLS/SSL
991 TCP, UDP NAS (Netnews Admin System)  
992 TCP, UDP Telnet protocol over TLS/SSL
993 TCP IMAP4 over SSL (encrypted transmission)
995 TCP POP3 over SSL (encrypted transmission)