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443 is allocated to HTTPS. Wikipedia has a list of the port allocations, and of course IANA has a list too. (It's rather long.) I don't know if there's any order in the allocations, but if there is, it isn't very obvious. Might be just "what was available at the time". As for TLS versions of old protocols, consider that HTTP is at 80, and HTTPS at 443, but (say) IMAP is at 143, but IMAPS at 993.

Also, there's things like SMTP, that are usually used with STARTTLS, that is, the TLS negotiation is done after the protocol is started in plaintext. In which case it's the same port for plaintext and TLS-encapsulated traffic... (namely 25 for SMTP). There's another port that has been used for SMTP/TLS: 465, but it's considered obsolete, and doesn't appear in the IANA list.

443 is allocated to HTTPS. Wikipedia has a list of the port allocations, and of course IANA has a list too. (It's rather long.) I don't know if there's any order in the allocations, but if there is, it isn't very obvious. Might be just "what was available at the time". As for TLS versions of old protocols, consider that HTTP is at 80, and HTTPS at 443, but (say) IMAP is at 143, but IMAPS at 993.

443 is allocated to HTTPS. Wikipedia has a list of the port allocations, and of course IANA has a list too. (It's rather long.) I don't know if there's any order in the allocations, but if there is, it isn't very obvious. Might be just "what was available at the time". As for TLS versions of old protocols, consider that HTTP is at 80, and HTTPS at 443, but (say) IMAP is at 143, but IMAPS at 993.

Also, there's things like SMTP, that are usually used with STARTTLS, that is, the TLS negotiation is done after the protocol is started in plaintext. In which case it's the same port for plaintext and TLS-encapsulated traffic... (namely 25 for SMTP). There's another port that has been used for SMTP/TLS: 465, but it's considered obsolete, and doesn't appear in the IANA list.

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source | link

443 is allocated to HTTPS. Wikipedia has a list of the port allocations, and of course IANA has a list too. (It's rather long.) I don't know if there's any order in the allocations, but if there is, it isn't very obvious. Might be just "what was available at the time". As for TLS versions of old protocols, consider that HTTP is at 80, and HTTPS at 443, but (say) IMAP is at 143, but IMAPS at 993.