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Port 4457 (prRegister)

IANA assigns port 4457 to prRegister: PR Register.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
prRegister TCP PR Register Donny Gilor -
prRegister UDP PR Register Donny Gilor -

Check what is listening on port 4457

Linux: is anything listening on TCP 4457?
sudo ss -tlnp 'sport = :4457'
Linux: UDP 4457
sudo ss -ulnp 'sport = :4457'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4457
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4457 '
Windows (Command Prompt)
netstat -ano | findstr :4457
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4457 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4457
From Windows
Test-NetConnection HOST -Port 4457
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4457

Block port 4457 in the firewall

ufw
sudo ufw deny 4457/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4457 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4457 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4457' -Direction Inbound -Protocol TCP -LocalPort 4457 -Action Block
ufw
sudo ufw deny 4457/udp
iptables
sudo iptables -A INPUT -p udp --dport 4457 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4457 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4457' -Direction Inbound -Protocol UDP -LocalPort 4457 -Action Block

Related ports

4455prchat-user4456prchat-server4458mcp4460NTS-KE (Network Time Security)

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