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Port 2445 (dtn1)

IANA assigns port 2445 to dtn1: DTN1.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
dtn1 TCP DTN1 Bob Gaddie -
dtn1 UDP DTN1 Bob Gaddie -

Check what is listening on port 2445

Linux: is anything listening on TCP 2445?
sudo ss -tlnp 'sport = :2445'
Linux: UDP 2445
sudo ss -ulnp 'sport = :2445'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2445
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2445 '
Windows (Command Prompt)
netstat -ano | findstr :2445
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2445 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2445
From Windows
Test-NetConnection HOST -Port 2445
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2445

Block port 2445 in the firewall

ufw
sudo ufw deny 2445/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2445 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2445 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2445' -Direction Inbound -Protocol TCP -LocalPort 2445 -Action Block
ufw
sudo ufw deny 2445/udp
iptables
sudo iptables -A INPUT -p udp --dport 2445 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2445 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2445' -Direction Inbound -Protocol UDP -LocalPort 2445 -Action Block

Related ports

2443powerclientcsf2444btpp2sectrans2446bues-service, bues_service2447ovwdb

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