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Port 44553 (rbr-debug)

IANA assigns port 44553 to rbr-debug: REALbasic Remote Debug.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
rbr-debug TCP REALbasic Remote Debug Aaron Ballman -
rbr-debug UDP REALbasic Remote Debug Aaron Ballman -

Registry dates for this port: registered 2004-11.

Check what is listening on port 44553

Linux: is anything listening on TCP 44553?
sudo ss -tlnp 'sport = :44553'
Linux: UDP 44553
sudo ss -ulnp 'sport = :44553'
Linux / macOS: which process owns the port
sudo lsof -nP -i :44553
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':44553 '
Windows (Command Prompt)
netstat -ano | findstr :44553
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 44553 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 44553
From Windows
Test-NetConnection HOST -Port 44553
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 44553

Block port 44553 in the firewall

ufw
sudo ufw deny 44553/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 44553 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 44553 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 44553' -Direction Inbound -Protocol TCP -LocalPort 44553 -Action Block
ufw
sudo ufw deny 44553/udp
iptables
sudo iptables -A INPUT -p udp --dport 44553 -j DROP
nftables
sudo nft add rule inet filter input udp dport 44553 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 44553' -Direction Inbound -Protocol UDP -LocalPort 44553 -Action Block

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