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Port 630 (rda)

IANA assigns port 630 to rda: RDA.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
rda TCP RDA John Hadjioannou -
rda UDP RDA John Hadjioannou -

Check what is listening on port 630

Linux: is anything listening on TCP 630?
sudo ss -tlnp 'sport = :630'
Linux: UDP 630
sudo ss -ulnp 'sport = :630'
Linux / macOS: which process owns the port
sudo lsof -nP -i :630
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':630 '
Windows (Command Prompt)
netstat -ano | findstr :630
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 630 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 630
From Windows
Test-NetConnection HOST -Port 630
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 630

Block port 630 in the firewall

ufw
sudo ufw deny 630/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 630 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 630 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 630' -Direction Inbound -Protocol TCP -LocalPort 630 -Action Block
ufw
sudo ufw deny 630/udp
iptables
sudo iptables -A INPUT -p udp --dport 630 -j DROP
nftables
sudo nft add rule inet filter input udp dport 630 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 630' -Direction Inbound -Protocol UDP -LocalPort 630 -Action Block

Related ports

2371rda628qmqp6293com-amp3631IPP / CUPS632bmpp

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