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Port 48003 (nimgtw)

IANA assigns port 48003 to nimgtw: Nimbus Gateway.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
nimgtw TCP Nimbus Gateway Carstein Seeberg 2 -
nimgtw UDP Nimbus Gateway Carstein Seeberg 2 -

Check what is listening on port 48003

Linux: is anything listening on TCP 48003?
sudo ss -tlnp 'sport = :48003'
Linux: UDP 48003
sudo ss -ulnp 'sport = :48003'
Linux / macOS: which process owns the port
sudo lsof -nP -i :48003
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':48003 '
Windows (Command Prompt)
netstat -ano | findstr :48003
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 48003 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 48003
From Windows
Test-NetConnection HOST -Port 48003
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 48003

Block port 48003 in the firewall

ufw
sudo ufw deny 48003/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 48003 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 48003 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 48003' -Direction Inbound -Protocol TCP -LocalPort 48003 -Action Block
ufw
sudo ufw deny 48003/udp
iptables
sudo iptables -A INPUT -p udp --dport 48003 -j DROP
nftables
sudo nft add rule inet filter input udp dport 48003 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 48003' -Direction Inbound -Protocol UDP -LocalPort 48003 -Action Block

Related ports

48001nimspooler48002nimhub48004nimbusdb48005nimbusdbctrl

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