HTTPfy

Port 1183 (llsurfup-http)

IANA assigns port 1183 to llsurfup-http: LL Surfup HTTP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
llsurfup-http TCP LL Surfup HTTP - -
llsurfup-http UDP LL Surfup HTTP - -

Check what is listening on port 1183

Linux: is anything listening on TCP 1183?
sudo ss -tlnp 'sport = :1183'
Linux: UDP 1183
sudo ss -ulnp 'sport = :1183'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1183
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1183 '
Windows (Command Prompt)
netstat -ano | findstr :1183
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1183 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1183
From Windows
Test-NetConnection HOST -Port 1183
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1183

Block port 1183 in the firewall

ufw
sudo ufw deny 1183/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1183 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1183 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1183' -Direction Inbound -Protocol TCP -LocalPort 1183 -Action Block
ufw
sudo ufw deny 1183/udp
iptables
sudo iptables -A INPUT -p udp --dport 1183 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1183 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1183' -Direction Inbound -Protocol UDP -LocalPort 1183 -Action Block

Related ports

11813comnetman1182accelenet, accelenet-data1184llsurfup-https1185catchpole

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.