HTTPfy

Port 2253 (dtv-chan-req)

IANA assigns port 2253 to dtv-chan-req: DTV Channel Request.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
dtv-chan-req TCP DTV Channel Request Richard Hodges -
dtv-chan-req UDP DTV Channel Request Richard Hodges -

Check what is listening on port 2253

Linux: is anything listening on TCP 2253?
sudo ss -tlnp 'sport = :2253'
Linux: UDP 2253
sudo ss -ulnp 'sport = :2253'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2253
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2253 '
Windows (Command Prompt)
netstat -ano | findstr :2253
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2253 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2253
From Windows
Test-NetConnection HOST -Port 2253
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2253

Block port 2253 in the firewall

ufw
sudo ufw deny 2253/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2253 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2253 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2253' -Direction Inbound -Protocol TCP -LocalPort 2253 -Action Block
ufw
sudo ufw deny 2253/udp
iptables
sudo iptables -A INPUT -p udp --dport 2253 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2253 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2253' -Direction Inbound -Protocol UDP -LocalPort 2253 -Action Block

Related ports

2251dif-port2252njenet-ssl2254seispoc2255vrtp

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