HTTPfy

Port 3880 (igrs)

IANA assigns port 3880 to igrs: IGRS.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
igrs TCP IGRS Huang Jingnan -
igrs UDP IGRS Huang Jingnan -

Registry dates for this port: registered 2003-10.

Check what is listening on port 3880

Linux: is anything listening on TCP 3880?
sudo ss -tlnp 'sport = :3880'
Linux: UDP 3880
sudo ss -ulnp 'sport = :3880'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3880
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3880 '
Windows (Command Prompt)
netstat -ano | findstr :3880
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3880 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3880
From Windows
Test-NetConnection HOST -Port 3880
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3880

Block port 3880 in the firewall

ufw
sudo ufw deny 3880/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3880 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3880 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3880' -Direction Inbound -Protocol TCP -LocalPort 3880 -Action Block
ufw
sudo ufw deny 3880/udp
iptables
sudo iptables -A INPUT -p udp --dport 3880 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3880 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3880' -Direction Inbound -Protocol UDP -LocalPort 3880 -Action Block

Related ports

3878fotogcad3879appss-lm3881idac3882msdts1

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