Port 993 — IMAPS
Quick reference for TCP/UDP port 993, used by IMAPS. Includes what the service does, security guidance and related ports.
What is port 993?
IMAP over TLS.
What port does IMAPS use?
IMAPS listens on port 993 by default.
Is port 993 open? How to check
Run one of these from your computer, replacing HOST with the IP address or domain you want to test.
nc -zv HOST 993
Test-NetConnection HOST -Port 993
nmap -p 993 HOST
A refused or timed-out connection means the port is closed or filtered by a firewall.
Security guidance
Low risk — designed for public exposure
Port 993 (IMAPS) is designed for public exposure. Standard hardening (TLS certs, current firmware, sensible rate limits) is enough — no special isolation needed.
Related ports
Frequently asked
What is port 993 used for?+
Port 993 is the standard TCP/UDP port for IMAPS. IMAP over TLS.
What port does IMAPS use?+
IMAPS listens on port 993 by default.
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