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Port 1335 (digital-notary)

IANA assigns port 1335 to digital-notary: Digital Notary Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
digital-notary TCP Digital Notary Protocol Wes Doonan -
digital-notary UDP Digital Notary Protocol Wes Doonan -

Check what is listening on port 1335

Linux: is anything listening on TCP 1335?
sudo ss -tlnp 'sport = :1335'
Linux: UDP 1335
sudo ss -ulnp 'sport = :1335'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1335
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1335 '
Windows (Command Prompt)
netstat -ano | findstr :1335
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1335 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1335
From Windows
Test-NetConnection HOST -Port 1335
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1335

Block port 1335 in the firewall

ufw
sudo ufw deny 1335/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1335 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1335 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1335' -Direction Inbound -Protocol TCP -LocalPort 1335 -Action Block
ufw
sudo ufw deny 1335/udp
iptables
sudo iptables -A INPUT -p udp --dport 1335 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1335 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1335' -Direction Inbound -Protocol UDP -LocalPort 1335 -Action Block

Related ports

1333passwrd-policy1334writesrv1336ischat1337menandmice-dns

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