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Port 2423 (rnrp)

IANA assigns port 2423 to rnrp: RNRP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
rnrp TCP RNRP Per Sahlqvist -
rnrp UDP RNRP Per Sahlqvist -

Check what is listening on port 2423

Linux: is anything listening on TCP 2423?
sudo ss -tlnp 'sport = :2423'
Linux: UDP 2423
sudo ss -ulnp 'sport = :2423'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2423
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2423 '
Windows (Command Prompt)
netstat -ano | findstr :2423
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2423 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2423
From Windows
Test-NetConnection HOST -Port 2423
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2423

Block port 2423 in the firewall

ufw
sudo ufw deny 2423/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2423 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2423 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2423' -Direction Inbound -Protocol TCP -LocalPort 2423 -Action Block
ufw
sudo ufw deny 2423/udp
iptables
sudo iptables -A INPUT -p udp --dport 2423 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2423 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2423' -Direction Inbound -Protocol UDP -LocalPort 2423 -Action Block

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