TCP
    20: ftp data
    21: ftp control
    22: ssh
    23: telnet
    25: SMTP (mail)
    37: Time protocol
    53: Bind/DNS
    69: TFTP (Trivial FTP)
    80: HTTP
    109: POP2
    110: POP3
    111: RPC Remote Procedure Call
    137: Netbios Name Service
    138: Netbios Datagram Service
    139: Netbios Session Service
    143: IMAP (mail)
    161: SNMP
    220: IMAP
    389: LDAP
    443: HTTPS
    445: MS Active Directory, SMB
    464: Kerberos
    1521: Oracle Database
    3000: Node JS
    3306: MySQL
UDP
    69: TFTP
    161: SNMP

http://www.0daysecurity.com/penetration-testing/enumeration.html