Port 1183 is registered with IANA for llsurfup-http (LL Surf Up HTTP), a service from LapLink Software that provided remote file access over HTTP. Port 1184 carried the HTTPS version.
This port is a historical artifact from the late 1990s, when "the cloud" didn't exist yet.
What LL Surf Up Was
LL Surf Up was a feature in LapLink's PCsync software that let you remotely access documents on your PC via the Internet.1 Before Dropbox, Google Drive, or iCloud, if you wanted to get a file from your home computer while traveling, you needed software like this.
You would install LapLink on your PC, configure it to listen on port 1183, and then access your files through a web interface from anywhere. The HTTP version used port 1183. The HTTPS version used port 1184.
It solved a real problem: "I'm at a conference and I need that presentation that's on my desktop at home." The solution just required port forwarding, a static IP or dynamic DNS service, and hope that your home PC didn't crash while you were gone.
Why This Port Exists in the Registry
Port 1183 sits in the registered ports range (1024-49151). This is the range where companies can request IANA assign a specific port number for their application or protocol.
LapLink registered 1183 and 1184 for their Surf Up feature. This gave the service "official" port numbers that wouldn't conflict with other applications. It also meant network administrators could write firewall rules specifically for LapLink traffic.
The registration is permanent. Even though the service is obsolete, port 1183 remains in IANA's database as "llsurfup-http."2
What Happened to It
LapLink still exists. They make PCmover (PC migration software) and Laplink Everywhere (modern remote management tools).3 But the Surf Up feature from the late 1990s is long gone.
Cloud storage made it obsolete. Why run software on your home PC and expose port 1183 to the Internet when you can drop files in Dropbox and access them from anywhere without thinking about ports, IP addresses, or whether your computer is turned on?
Port 1183 is a fossil from an era when remote access required software you installed from a CD-ROM, not a browser tab you open.
Should You See Traffic on Port 1183?
Probably not. If you see connections on port 1183, it's likely one of three things:
- Legacy LapLink installation — Someone still running ancient LapLink software
- Port scanner — Security scanners probing your network
- Custom application — Some software using 1183 because it happened to be available
To check what's listening on port 1183:
Linux/Mac:
Windows:
Related Ports
- Port 1184 — llsurfup-https, the HTTPS version of LapLink Surf Up
- Port 3389 — Modern Remote Desktop Protocol (RDP), which largely replaced tools like LapLink for Windows remote access
- Port 5900 — VNC, another remote access protocol from the same era
The Broader Context
Registered ports like 1183 tell a story about the Internet's history. Companies in the 1990s and early 2000s registered port numbers for services that seemed essential at the time. Many of those services are now forgotten, but their port numbers remain in the registry forever.
The registered ports range contains thousands of these fossils—protocols that solved real problems in their era, then were made obsolete by better solutions. Port 1183 is one of them.
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