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Port 2456 (altav-remmgt)

IANA assigns port 2456 to altav-remmgt.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
altav-remmgt TCP altav-remmgt Gary M Allen -
altav-remmgt UDP altav-remmgt Gary M Allen -

Check what is listening on port 2456

Linux: is anything listening on TCP 2456?
sudo ss -tlnp 'sport = :2456'
Linux: UDP 2456
sudo ss -ulnp 'sport = :2456'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2456
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2456 '
Windows (Command Prompt)
netstat -ano | findstr :2456
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2456 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2456
From Windows
Test-NetConnection HOST -Port 2456
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2456

Block port 2456 in the firewall

ufw
sudo ufw deny 2456/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2456 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2456 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2456' -Direction Inbound -Protocol TCP -LocalPort 2456 -Action Block
ufw
sudo ufw deny 2456/udp
iptables
sudo iptables -A INPUT -p udp --dport 2456 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2456 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2456' -Direction Inbound -Protocol UDP -LocalPort 2456 -Action Block

Related ports

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