HTTPfy

Port 3151 (nm-assessor)

IANA assigns port 3151 to nm-assessor: NetMike Assessor.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
nm-assessor TCP NetMike Assessor Andrew Sharpe -
nm-assessor UDP NetMike Assessor Andrew Sharpe -

Check what is listening on port 3151

Linux: is anything listening on TCP 3151?
sudo ss -tlnp 'sport = :3151'
Linux: UDP 3151
sudo ss -ulnp 'sport = :3151'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3151
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3151 '
Windows (Command Prompt)
netstat -ano | findstr :3151
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3151 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3151
From Windows
Test-NetConnection HOST -Port 3151
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3151

Block port 3151 in the firewall

ufw
sudo ufw deny 3151/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3151 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3151 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3151' -Direction Inbound -Protocol TCP -LocalPort 3151 -Action Block
ufw
sudo ufw deny 3151/udp
iptables
sudo iptables -A INPUT -p udp --dport 3151 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3151 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3151' -Direction Inbound -Protocol UDP -LocalPort 3151 -Action Block

Related ports

3149nm-game-server3150nm-asses-admin3152feitianrockey3153s8-client-port

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