HTTPfy

Port 8351 (server-find)

IANA assigns port 8351 to server-find: Server Find.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
server-find TCP Server Find Chris Brown -
server-find UDP Server Find Chris Brown -

Check what is listening on port 8351

Linux: is anything listening on TCP 8351?
sudo ss -tlnp 'sport = :8351'
Linux: UDP 8351
sudo ss -ulnp 'sport = :8351'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8351
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8351 '
Windows (Command Prompt)
netstat -ano | findstr :8351
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8351 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8351
From Windows
Test-NetConnection HOST -Port 8351
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8351

Block port 8351 in the firewall

ufw
sudo ufw deny 8351/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8351 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8351 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8351' -Direction Inbound -Protocol TCP -LocalPort 8351 -Action Block
ufw
sudo ufw deny 8351/udp
iptables
sudo iptables -A INPUT -p udp --dport 8351 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8351 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8351' -Direction Inbound -Protocol UDP -LocalPort 8351 -Action Block

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