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Port 2737 (srp-feedback)

IANA assigns port 2737 to srp-feedback: SRP Feedback.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
srp-feedback TCP SRP Feedback Werner Almesberger -
srp-feedback UDP SRP Feedback Werner Almesberger -

Check what is listening on port 2737

Linux: is anything listening on TCP 2737?
sudo ss -tlnp 'sport = :2737'
Linux: UDP 2737
sudo ss -ulnp 'sport = :2737'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2737
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2737 '
Windows (Command Prompt)
netstat -ano | findstr :2737
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2737 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2737
From Windows
Test-NetConnection HOST -Port 2737
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2737

Block port 2737 in the firewall

ufw
sudo ufw deny 2737/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2737 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2737 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2737' -Direction Inbound -Protocol TCP -LocalPort 2737 -Action Block
ufw
sudo ufw deny 2737/udp
iptables
sudo iptables -A INPUT -p udp --dport 2737 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2737 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2737' -Direction Inbound -Protocol UDP -LocalPort 2737 -Action Block

Related ports

2735netiq-mc2736radwiz-nms-srv2738ndl-tcp-ois-gw2739tn-timing

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