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Which port number is conventionally used by HTTP (cleartext)?

A21
B22
C23
D80
Answer & Solution
Correct answer: D. 80
1. Well-known port assignments (IANA): - 21: FTP control - 22: SSH - 23: Telnet - 25: SMTP - 53: DNS - 80: HTTP (cleartext) - 110: POP3 - 143: IMAP - 443: HTTPS 2. So HTTP uses port 80 — option D. 3. Option A is FTP. Option B is SSH. Option C is Telnet. _Source: RFC 1180 "A TCP/IP Tutorial", §8 (Network Applications)._
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