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Port 3175 (t1-e1-over-ip)

IANA assigns port 3175 to t1-e1-over-ip: T1_E1_Over_IP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
t1-e1-over-ip TCP T1_E1_Over_IP Mark Doyle -
t1-e1-over-ip UDP T1_E1_Over_IP Mark Doyle -

Check what is listening on port 3175

Linux: is anything listening on TCP 3175?
sudo ss -tlnp 'sport = :3175'
Linux: UDP 3175
sudo ss -ulnp 'sport = :3175'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3175
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3175 '
Windows (Command Prompt)
netstat -ano | findstr :3175
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3175 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3175
From Windows
Test-NetConnection HOST -Port 3175
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3175

Block port 3175 in the firewall

ufw
sudo ufw deny 3175/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3175 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3175 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3175' -Direction Inbound -Protocol TCP -LocalPort 3175 -Action Block
ufw
sudo ufw deny 3175/udp
iptables
sudo iptables -A INPUT -p udp --dport 3175 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3175 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3175' -Direction Inbound -Protocol UDP -LocalPort 3175 -Action Block

Related ports

3173serverview-icc3174armi-server3176ars-master3177phonex-port

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