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Port 267 (td-service)

IANA assigns port 267 to td-service: Tobit David Service Layer.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
td-service TCP Tobit David Service Layer - -
td-service UDP Tobit David Service Layer - -

Check what is listening on port 267

Linux: is anything listening on TCP 267?
sudo ss -tlnp 'sport = :267'
Linux: UDP 267
sudo ss -ulnp 'sport = :267'
Linux / macOS: which process owns the port
sudo lsof -nP -i :267
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':267 '
Windows (Command Prompt)
netstat -ano | findstr :267
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 267 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 267
From Windows
Test-NetConnection HOST -Port 267
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 267

Block port 267 in the firewall

ufw
sudo ufw deny 267/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 267 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 267 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 267' -Direction Inbound -Protocol TCP -LocalPort 267 -Action Block
ufw
sudo ufw deny 267/udp
iptables
sudo iptables -A INPUT -p udp --dport 267 -j DROP
nftables
sudo nft add rule inet filter input udp dport 267 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 267' -Direction Inbound -Protocol UDP -LocalPort 267 -Action Block

Related ports

265x-bone-ctl266sst268td-replica269manet

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