What is port numbers in Networking?
Well-Known” are port numbers that have been reserved for common applications, typically server applications. The port numbers assigned to server applications have to be known by the client’s Transport layer, so these can add the correct destination port number to messages. List of known ports are as follows
FAQ : The well-known port numbers are assigned by IANA i.e. Internet Assigned Numbers Authority. IANA is the same group that manages the DNS Root and IP addresses.
Lets decryptinfo about port numbers
List of Well-Known Network ports
| Service | Port | Protocol |
| Echo | 7 | TCP |
| Systat | 11 | TCP |
| Chargen | 19 | TCP |
| Ftp-data | 21 | TCP |
| SSH | 22 | TCP |
| Telnet | 23 | TCP |
| 25 | TCP | |
| Nameserver | 42 | TCP |
| Whois | 43 | TCP |
| Tacacs | 49 | UDP |
| Xns-time | 52 | TCP |
| Xns-time | 52 | UDP |
| Dns-lookup | 53 | UDP |
| Dns-zone | 53 | TCP |
| Whois++ | 63 | TCP/UDP |
| Tacacs-ds | 65 | TCP/UDP |
| Oracle-sqlnet | 66 | TCP |
| Bootps | 67 | TCP/UDP |
| Bootpc | 68 | TCP/UDP |
| Tftp | 69 | UDP |
| Gopher | 70 | TCP/UDP |
| Finger | 79 | TCP |
| Http | 80 | TCP |
| Alternate-http | 81 | TCP |
| Objcall(Tivoli) | 94 | TCP/UDP |
| Kerberos | 88 | TCP |
| Linuxconf | 98 | TCP |
| Rtelent | 107 | TCP/UDP |
| Pop2 | 109 | TCP |
| Pop3 | 110 | TCP |
| Sunrpc | 111 | TCP |
| Sqlserv | 118 | TCP |
| Nntp | 119 | TCP |
| Ntp | 123 | TCP/UDP |
| Ntrpc-or-dce(epmap) | 135 | TCP/UDP |
| Netbios-ns | 137 | TCP/UDP |
| Netbios-dgm | 138 | TCP/UDP |
| Netbios | 139 | TCP |
| IMAP | 143 | TCP |
| Sqlsrv | 156 | TCP/UDP |
| Snmp | 161 | UDP |
| Snmp-trap | 162 | UDP |
| Xdmcp | 177 | TCP/UDP |
| Bgp | 179 | TCP |
| Irc | 194 | TCP/UDP |
| Snmp-checkpoint | 256 | TCP |
| Snmp-checkpoint | 257 | TCP |
| Snmp-checkpoint | 258 | TCP |
| Snmp-checkpoint | 259 | TCP |
| Fw1-or-bgmp | 264 | UDP |
| Ldap | 389 | TCP |
| Netware-ip | 396 | TCP |
| Ups | 401 | TCP/UDP |
| Timbuktu | 407 | TCP |
| Https/ssl | 443 | TCP |
| Ms-smb-alternate | 445 | TCP/UDP |
| Kpasswd5 | 464 | TCP/UDP |
| Ipsec-internet-key-exchange(ike) | 500 | UDP |
| Exec | 512 | TCP |
| Rlogin | 513 | TCP |
| Rwho | 513 | UDP |
| Rshell | 514 | TCP |
| Syslog | 514 | UDP |
| Printer | 515 | TCP/UDP |
| Talk | 517 | TCP/UDP |
| Ntalk | 518 | TCP/UDP |
| Route/RIP/RIPv2 | 520 | UDP |
| Netware-ncp | 524 | TCP |
| Timed | 525 | TCP/UDP |
| Irc-serv | 529 | TCP/UDP |
| Uucp | 540 | TCP/UDP |
| Klogin | 543 | TCP/UDP |
| Apple-xsrvr-admin | 625 | TCP |
| Apple-imap-admin | 626 | TCP |
| Mount | 645 | UDP |
| Mac-srvr-admin | 660 | TCP/UDP |
| Spamassassin | 783 | TCP |
| Remotelypossible | 799 | TCP |
| Rsync | 873 | TCP |
| Samba-swat | 901 | TCP |
| Oftep-rpc | 950 | TCP |
| Ftps | 990 | TCP |
| Telnets | 992 | TCP |
| Imaps | 993 | TCP |
| Ircs | 994 | TCP |
| Pop3s | 995 | TCP |
| W2k-RPC-Services | 1024-1030 | TCP/UDP |
| Socks | 1080 | TCP |
| Kpop | 1109 | TCP |
| Msql | 1112 | TCP |
| Fastrack(Kazaa) | 1212 | TCP |
| Bmc-patrol-db | 1313 | TCP |
| Notes | 1352 | TCP |
| Timbuktu-srv1 | 1417-1420 | TCP/UDP |
| Ms-sql | 1433 | TCP |
| Citrix | 1494 | TCP |
| Sybase-sql-anywhere | 1498 | TCP |
| Funkproxy | 1505 | TCP/UDP |
| Ingres-lock | 1524 | TCP |
| Oracle-srv | 1525 | TCP |
| Oracle-tli | 1527 | TCP |
| Pptp | 1723 | TCP |
| Winsock-proxy | 1745 | TCP |
| Landesk-rc | 1761-1764 | TCP |
| Radius | 1812 | UDP |
| Remotely-anywhere | 2000 | TCP |
| Cisco-mgmt | 2001 | TCP |
| Nfs | 2049 | TCP |
| Compaq-web | 2301 | TCP |
| Sybase | 2368 | TCP |
| Openview | 2447 | TCP |
| Realsecure | 2998 | TCP |
| Nessusd | 3001 | TCP |
| Ccmail | 3264 | TCP/UDP |
| Ms-active-dir-global-catalog | 3268 | TCP/UDP |
| Bmc-patrol-agent | 3300 | TCP |
| Mysql | 3306 | TCP |
| Ssql | 3351 | TCP |
| Ms-termserv | 3389 | TCP |
| Squid-snmp | 3401 | UDP |
| Cisco-Management | 4001 | TCP |
| Nfs-lockd | 4045 | TCP |
| Twhois | 4321 | TCP/UDP |
| Edonkey | 4660 | TCP |
| Edonkey | 4666 | UDP |
| Airport-admin | 5009 | TCP |
| Sip | 5060 | TCP/UDP |
| Zeroconf(Bonjour) | 5353 | UDP |
| Postgress | 5432 | TCP |
| Connect-proxy | 5490 | TCP |
| Secured | 5500 | UDP |
| PcAnywhere | 5631 | TCP |
| Activesync | 5679 | TCP |
| Vnc | 5800 | TCP |
| Vnc-java | 5900 | TCP |
| Xwindows | 6000 | TCP |
| Cisco-mgmt | 6001 | TCP |
| Arcserve | 6050 | TCP |
| Backupexec | 6101 | TCP |
| Gnutella | 6346 | TCP/UDP |
| Gnutella2 | 6347 | TCP/UDP |
| Apc | 6549 | TCP |
| Irc | 6665-6670 | TCP |
| Font-service | 7100 | TCP/UDP |
| OpenManage(Dell) | 7273 | TCP |
| Web | 8000 | TCP |
| Web | 8001 | TCP |
| Web | 8002 | TCP |
| Web | 8080 | TCP |
| Blackice-icecap | 8081 | TCP |
| Privoxy | 8118 | TCP |
| Apple-iphoto | 8770 | TCP |
| Cisco-xremote | 9001 | TCP |
| Jetdirect | 9100 | TCP |
| Dragon-ids | 9111 | TCP |
| ISS-system-scanner-agent | 9991 | TCP |
| ISS-system-scanner-console | 9992 | TCP |
| Stel | 10005 | TCP |
| Netbus | 12345 | TCP |
| Snmp-checkpoint | 18210 | TCP |
| Snmp-checkpoint | 18211 | TCP |