Port allow computers to send data while identifying data by category

  • Most common ports range from 1 to 1023. Used in daily operations
  • Registered ports range from 1024 to 49151. This ports identified as usable by other applications
  • Dynamic ports range from 49152 to 65535. This ports are free and available for any TCP and UDP request made by application

Well known ports

Port No. Protocol Service Name Aliases Comment
7 TCP echo Echo
7 UDP echo Echo
9 TCP discard sink null Discard
9 UDP discard sink null Discard
13 TCP daytime Daytime
13 UDP daytime Daytime
17 TCP qotd quote Quote of the day
17 UDP qotd quote Quote of the day
19 TCP chargen ttytst source Character generator
19 UDP chargen ttytst source Character generator
20 TCP ftp-data File Transfer
21 TCP ftp FTP Control
23 TCP telnet Telnet
25 TCP smtp mail Simple Mail Transfer
37 TCP time Time
37 UDP time Time
39 UDP rlp resource Resource Location Protocol
42 TCP nameserver name Host Name Server
42 UDP nameserver name Host Name Server
43 TCP nicname whois Who Is
53 TCP domain Domain Name
53 UDP domain Domain Name Server
67 UDP bootps dhcps Bootstrap Protocol Server
68 UDP bootpc dhcpc Bootstrap Protocol Client
69 UDP tftp Trivial File Transfer
70 TCP gopher Gopher
79 TCP finger Finger
80 TCP http www, http World Wide Web
88 TCP kerberos krb5 Kerberos
88 UDP kerberos krb5 Kerberos
101 TCP hostname hostnames NIC Host Name Server
102 TCP iso-tsap ISO-TSAP Class 0
107 TCP rtelnet Remote Telnet Service
109 TCP pop2 postoffice Post Office Protocol – Version 2
110 TCP pop3 postoffice Post Office Protocol – Version 3
111 TCP sunrpc rpcbind portmap SUN Remote Procedure Call
111 UDP sunrpc rpcbind portmap SUN Remote Procedure Call
113 TCP auth ident tap Authentication Sevice
117 TCP uucp-path UUCP Path Service
119 TCP nntp usenet Network News Transfer Protocol
123 UDP ntp Network Time Protocol
135 TCP epmap loc-srv DCE endpoint resolution
135 UDP epmap loc-srv DCE endpoint resolution
137 TCP netbios-ns nbname NETBIOS Name Service
137 UDP netbios-ns nbname NETBIOS Name Service
138 UDP netbios-dgm nbdatagram NETBIOS Datagram Service
139 TCP netbios-ssn nbsession NETBIOS Session Service
143 TCP imap imap4 Internet Message Access Protocol
158 TCP pcmail-srv repository PC Mail Server
161 UDP snmp snmp SNMP
162 UDP snmptrap snmp-trap SNMP TRAP
170 TCP print-srv Network PostScript
179 TCP bgp Border Gateway Protocol
194 TCP irc Internet Relay Chat Protocol
213 UDP ipx IPX over IP
389 TCP ldap Lightweight Directory Access Protocol
443 TCP https MCom
443 UDP https MCom
445 TCP Microsoft CIFS
445 UDP Microsoft CIFS
464 TCP kpasswd Kerberos (v5)
464 UDP kpasswd Kerberos (v5)
500 UDP isakmp ike Internet Key Exchange (IPSec)
512 TCP exec Remote Process Execution
512 UDP biff comsat Notifies users of new mail
513 TCP login Remote Login
513 UDP who whod Database of who’s logged on, average load
514 TCP cmd shell Automatic Authentication
514 UDP syslog
515 TCP printer spooler Listens for incoming connections
517 UDP talk Establishes TCP Connection
518 UDP ntalk
520 TCP efs Extended File Name Server
520 UDP router router routed RIPv.1, RIPv.2
525 UDP timed timeserver Timeserver
526 TCP tempo newdate Newdate
530 TCP,UDP courier rpc RPC
531 TCP conference chat IRC Chat
532 TCP netnews readnews Readnews
533 UDP netwall For emergency broadcasts
540 TCP uucp uucpd Uucpd
543 TCP klogin Kerberos login
544 TCP kshell krcmd Kerberos remote shell
550 UDP new-rwho new-who New-who
556 TCP remotefs rfs rfs_server Rfs Server
560 UDP rmonitor rmonitord Rmonitor
561 UDP monitor
636 TCP ldaps sldap LDAP over TLS/SSL
749 TCP kerberos-adm Kerberos administration
749 UDP kerberos-adm Kerberos administration