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Port 10100 (itap-ddtp)

IANA assigns port 10100 to itap-ddtp: VERITAS ITAP DDTP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
itap-ddtp TCP VERITAS ITAP DDTP Saugata Guha -
itap-ddtp UDP VERITAS ITAP DDTP Saugata Guha -

Registry dates for this port: registered 2004-05.

Check what is listening on port 10100

Linux: is anything listening on TCP 10100?
sudo ss -tlnp 'sport = :10100'
Linux: UDP 10100
sudo ss -ulnp 'sport = :10100'
Linux / macOS: which process owns the port
sudo lsof -nP -i :10100
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':10100 '
Windows (Command Prompt)
netstat -ano | findstr :10100
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 10100 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 10100
From Windows
Test-NetConnection HOST -Port 10100
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 10100

Block port 10100 in the firewall

ufw
sudo ufw deny 10100/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 10100 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 10100 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 10100' -Direction Inbound -Protocol TCP -LocalPort 10100 -Action Block
ufw
sudo ufw deny 10100/udp
iptables
sudo iptables -A INPUT -p udp --dport 10100 -j DROP
nftables
sudo nft add rule inet filter input udp dport 10100 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 10100' -Direction Inbound -Protocol UDP -LocalPort 10100 -Action Block

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