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A quick reference guide to common port numbers used in networking, particularly relevant for the comptia network+ certification. It lists well-known, registered, and dynamic port numbers, along with their corresponding protocols such as http, pop3, dhcp, ntp, tftp, https, ftp, smtp, imap4, telnet, ssh, and others. This information is essential for network administrators and it professionals to understand network communication and troubleshoot connectivity issues. The guide also includes port numbers for netbios, smb, dns, radius, tacacs, kerberos, snmp, ldap, vnc, rdp, rtsp, rtp, sip, h.323, and mgcp.
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80 ✔✔HTTP port number 110 ✔✔POP3 port number 67 and 68 ✔✔DHCP port numbers 0 - 1,023 ✔✔well known port numbers 67 ✔✔DHCP clients 68 ✔✔DHCP servers 123 ✔✔NTP port number 69 ✔✔TFTP port number
443 ✔✔HTTPS port number dynamic port numbers ✔✔49,152-65, registered port numbers ✔✔1,024-49, 20 and 21 ✔✔FTP port numbers 25 ✔✔SMTP port number 143 ✔✔IMAP4 port number 23 ✔✔Telnet port number 22 ✔✔SSH port number 513 ✔✔rlogon port number
5900 ✔✔Tight VNC port number 3389 ✔✔Mircrosoft RDP port number 554 ✔✔RTSP port number 5004 and 5005 ✔✔RTP port numbers 5060 and 5061 ✔✔SIP port numbers 1720 ✔✔H.323 port number 2427 and 2727 ✔✔MGCP port numbers