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Port 2889 (rsom)

IANA assigns port 2889 to rsom: RSOM.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
rsom TCP RSOM Justine Higgins -
rsom UDP RSOM Justine Higgins -

Check what is listening on port 2889

Linux: is anything listening on TCP 2889?
sudo ss -tlnp 'sport = :2889'
Linux: UDP 2889
sudo ss -ulnp 'sport = :2889'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2889
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2889 '
Windows (Command Prompt)
netstat -ano | findstr :2889
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2889 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2889
From Windows
Test-NetConnection HOST -Port 2889
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2889

Block port 2889 in the firewall

ufw
sudo ufw deny 2889/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2889 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2889 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2889' -Direction Inbound -Protocol TCP -LocalPort 2889 -Action Block
ufw
sudo ufw deny 2889/udp
iptables
sudo iptables -A INPUT -p udp --dport 2889 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2889 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2889' -Direction Inbound -Protocol UDP -LocalPort 2889 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.