Port 2319: Unassigned — Registered Range, No Official Tenant

What Range This Port Belongs To

Port 2319 is a registered port (also called a user port), in the range 1024–49151. IANA maintains this range as the space where protocols and applications can register official port assignments — but registration requires an application, a review, and an RFC or formal specification. Port 2319 has none of those. It is unassigned.¹

This puts it in an interesting position. It's not a well-known port (0–1023), which are reserved for foundational protocols and require IANA approval to use. It's not an ephemeral port (49152–65535), which operating systems assign freely and temporarily for outbound connections. It's in the middle — a port that could be claimed but hasn't been.

Commonly Observed Unofficial Uses

Several port database sites list port 2319 as associated with Symantec Endpoint Protection Manager (SEPM) client-server communication.² This attribution is unverified. Broadcom's own official SEP documentation lists the ports that product uses — and 2319 does not appear among them.³

This is a common pattern in port databases: one site attributes a port to a product, others copy it, and the association spreads without anyone checking the source. Until an authoritative source confirms it, treat the Symantec connection as folklore.

How to Check What's Listening on This Port

If you see traffic on port 2319 or want to know if anything is using it on your system:

On Linux/macOS:

# Show processes listening on port 2319
ss -tlnp sport = :2319

# Or with lsof
lsof -i :2319

On Windows:

# Show what's listening on port 2319
netstat -ano | findstr :2319

# Then look up the PID
tasklist /fi "PID eq <pid>"

If you find something listening there that you didn't put there, investigate it. Unassigned ports are attractive to malware precisely because nothing is supposed to be there — making unexpected traffic harder to notice.

Why Unassigned Ports Matter

The registered port range has 48,128 possible port numbers. Only a fraction have official IANA assignments. The rest are like this one — technically available, practically in use by whatever needs them.

This creates a problem: two different applications on the same system might both try to use port 2319 because neither has a formal claim. The first one to bind wins. The second one fails.

It also creates a security consideration. Unassigned ports show up in firewall rules as "allow all registered ports" — a policy that makes sense for assigned ports with known purposes, and much less sense for ports like this one where you genuinely don't know what's expected.

The honest answer about port 2319 is: it could be anything. Check before assuming.