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Port 1245 (isbconference2)

IANA assigns port 1245 to isbconference2.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
isbconference2 TCP isbconference2 Arnold Dittmann -
isbconference2 UDP isbconference2 Arnold Dittmann -

Check what is listening on port 1245

Linux: is anything listening on TCP 1245?
sudo ss -tlnp 'sport = :1245'
Linux: UDP 1245
sudo ss -ulnp 'sport = :1245'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1245
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1245 '
Windows (Command Prompt)
netstat -ano | findstr :1245
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1245 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1245
From Windows
Test-NetConnection HOST -Port 1245
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1245

Block port 1245 in the firewall

ufw
sudo ufw deny 1245/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1245 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1245 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1245' -Direction Inbound -Protocol TCP -LocalPort 1245 -Action Block
ufw
sudo ufw deny 1245/udp
iptables
sudo iptables -A INPUT -p udp --dport 1245 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1245 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1245' -Direction Inbound -Protocol UDP -LocalPort 1245 -Action Block

Related ports

1243serialgateway1244isbconference11246payrouter1247visionpyramid

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