Port 3262: NECP — The Protocol That Never Arrived

What Range This Port Belongs To

Port 3262 sits in the registered ports range (1024–49151). These ports are formally tracked by IANA, the Internet Assigned Numbers Authority, which maintains the global registry of who owns what. Unlike the well-known ports below 1024 (which carry foundational protocols like HTTP, SSH, and DNS), registered ports are available to any application or protocol that files a request. IANA records the assignment; the protocol does the rest.

Or is supposed to.

The Assigned Service: NECP

Port 3262 is officially assigned to NECP — the Network Element Control Protocol — on both TCP and UDP.¹

NECP was a lightweight signaling protocol designed to solve a real problem in early 2000s web infrastructure. The idea: load balancers and traffic-shaping switches needed to coordinate with the servers behind them. Which servers were available? Which flows could they handle? Which traffic should be redirected? At the time, the only answers were manual configuration or vendor-proprietary hacks. NECP aimed to standardize that conversation.

The draft was authored by Alberto Cerpa and Jeremy Elson at USC, with contributions from engineers at Radware, Akamai, and others working on the same problem.² The Network Element would listen on port 3262, receive availability and capability signals from servers, and use that information to make smarter forwarding decisions.

It was a sensible idea. It never became an RFC.

The IETF draft expired in August 2000 — six months after it was published — without advancing through the standards process.² No RFC number was assigned. No implementations became widespread. The port was registered, the draft was filed, and then NECP quietly disappeared. Other approaches (proprietary load balancer protocols, hardware vendor solutions, eventually HTTP health checks and modern orchestration) filled the gap instead.

What's Actually on This Port Today

Nothing standard. Because NECP never shipped, port 3262 has no legitimate widespread use. If you see traffic on this port, it's almost certainly one of three things:

• Custom or internal application — developers sometimes pick registered-but-unused ports for internal services
• Malware or scanning traffic — attackers probe unusual ports looking for anything listening
• Citrix NetScaler — Citrix uses a range of ports including nearby ones (3224–3324 UDP) for XenDesktop and XenApp; if you're in that environment, verify against your Citrix documentation

How to Check What's Listening

# Linux/macOS
sudo ss -tlnp | grep 3262
sudo lsof -i :3262

# Windows
netstat -ano | findstr :3262

If something is listening on 3262 and you don't know what it is, that's worth investigating. On a system that shouldn't be running custom services, an unexplained open port is a question worth answering.

Why Ghost Ports Matter

The registered port range contains hundreds of ports like 3262 — assigned to protocols that were proposed, failed to standardize, and then quietly faded. IANA doesn't reclaim them automatically. The assignments sit in the registry indefinitely.

This matters because unused registered ports are genuinely ambiguous. Port 3262 could be:

1. A legitimate internal application that chose an available registered port
2. A service that happens to use this port without claiming it
3. Something you should not ignore

The IANA assignment to NECP tells you only that someone, in 2000, had plans for this port. Those plans didn't survive contact with the IETF process. The port itself is just a number now.