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Port 1458 (nrcabq-lm)

IANA assigns port 1458 to nrcabq-lm: Nichols Research Corp..

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
nrcabq-lm TCP Nichols Research Corp. Howard Cole -
nrcabq-lm UDP Nichols Research Corp. Howard Cole -

Check what is listening on port 1458

Linux: is anything listening on TCP 1458?
sudo ss -tlnp 'sport = :1458'
Linux: UDP 1458
sudo ss -ulnp 'sport = :1458'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1458
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1458 '
Windows (Command Prompt)
netstat -ano | findstr :1458
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1458 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1458
From Windows
Test-NetConnection HOST -Port 1458
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1458

Block port 1458 in the firewall

ufw
sudo ufw deny 1458/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1458 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1458 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1458' -Direction Inbound -Protocol TCP -LocalPort 1458 -Action Block
ufw
sudo ufw deny 1458/udp
iptables
sudo iptables -A INPUT -p udp --dport 1458 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1458 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1458' -Direction Inbound -Protocol UDP -LocalPort 1458 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.