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Port 1452 (gtegsc-lm)

IANA assigns port 1452 to gtegsc-lm: GTE Government Systems License Man.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
gtegsc-lm TCP GTE Government Systems License Man Mike Gregory -
gtegsc-lm UDP GTE Government Systems License Man Mike Gregory -

Check what is listening on port 1452

Linux: is anything listening on TCP 1452?
sudo ss -tlnp 'sport = :1452'
Linux: UDP 1452
sudo ss -ulnp 'sport = :1452'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1452
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1452 '
Windows (Command Prompt)
netstat -ano | findstr :1452
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1452 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1452
From Windows
Test-NetConnection HOST -Port 1452
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1452

Block port 1452 in the firewall

ufw
sudo ufw deny 1452/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1452 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1452 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1452' -Direction Inbound -Protocol TCP -LocalPort 1452 -Action Block
ufw
sudo ufw deny 1452/udp
iptables
sudo iptables -A INPUT -p udp --dport 1452 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1452 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1452' -Direction Inbound -Protocol UDP -LocalPort 1452 -Action Block

Related ports

1450dwf1451infoman1453genie-lm1454interhdl-elmd, interhdl_elmd

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