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Port 48001 (nimspooler)

IANA assigns port 48001 to nimspooler: Nimbus Spooler.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
nimspooler TCP Nimbus Spooler Carstein Seeberg 2 -
nimspooler UDP Nimbus Spooler Carstein Seeberg 2 -

Check what is listening on port 48001

Linux: is anything listening on TCP 48001?
sudo ss -tlnp 'sport = :48001'
Linux: UDP 48001
sudo ss -ulnp 'sport = :48001'
Linux / macOS: which process owns the port
sudo lsof -nP -i :48001
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':48001 '
Windows (Command Prompt)
netstat -ano | findstr :48001
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 48001 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 48001
From Windows
Test-NetConnection HOST -Port 48001
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 48001

Block port 48001 in the firewall

ufw
sudo ufw deny 48001/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 48001 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 48001 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 48001' -Direction Inbound -Protocol TCP -LocalPort 48001 -Action Block
ufw
sudo ufw deny 48001/udp
iptables
sudo iptables -A INPUT -p udp --dport 48001 -j DROP
nftables
sudo nft add rule inet filter input udp dport 48001 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 48001' -Direction Inbound -Protocol UDP -LocalPort 48001 -Action Block

Related ports

47809presonus-ucnet48000nimcontroller48002nimhub48003nimgtw

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