HTTPfy

Port 1456 (dca)

IANA assigns port 1456 to dca: DCA.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
dca TCP DCA Jeff Garbers 2 -
dca UDP DCA Jeff Garbers 2 -

Check what is listening on port 1456

Linux: is anything listening on TCP 1456?
sudo ss -tlnp 'sport = :1456'
Linux: UDP 1456
sudo ss -ulnp 'sport = :1456'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1456
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1456 '
Windows (Command Prompt)
netstat -ano | findstr :1456
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1456 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1456
From Windows
Test-NetConnection HOST -Port 1456
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1456

Block port 1456 in the firewall

ufw
sudo ufw deny 1456/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1456 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1456 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1456' -Direction Inbound -Protocol TCP -LocalPort 1456 -Action Block
ufw
sudo ufw deny 1456/udp
iptables
sudo iptables -A INPUT -p udp --dport 1456 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1456 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1456' -Direction Inbound -Protocol UDP -LocalPort 1456 -Action Block

Related ports

1454interhdl-elmd, interhdl_elmd1455esl-lm1457valisys-lm1458nrcabq-lm

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