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Port 1351 (equationbuilder)

IANA assigns port 1351 to equationbuilder: Digital Tool Works (MIT).

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
equationbuilder TCP Digital Tool Works (MIT) Terrence J Talbot -
equationbuilder UDP Digital Tool Works (MIT) Terrence J Talbot -

Check what is listening on port 1351

Linux: is anything listening on TCP 1351?
sudo ss -tlnp 'sport = :1351'
Linux: UDP 1351
sudo ss -ulnp 'sport = :1351'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1351
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1351 '
Windows (Command Prompt)
netstat -ano | findstr :1351
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1351 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1351
From Windows
Test-NetConnection HOST -Port 1351
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1351

Block port 1351 in the firewall

ufw
sudo ufw deny 1351/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1351 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1351 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1351' -Direction Inbound -Protocol TCP -LocalPort 1351 -Action Block
ufw
sudo ufw deny 1351/udp
iptables
sudo iptables -A INPUT -p udp --dport 1351 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1351 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1351' -Direction Inbound -Protocol UDP -LocalPort 1351 -Action Block

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