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Port 5101 (talarian-tcp, talarian-udp)

IANA assigns port 5101 to talarian-tcp, talarian-udp: Talarian_TCP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
talarian-tcp TCP Talarian_TCP Leo Martins -
talarian-udp UDP Talarian_UDP Leo Martins -

Check what is listening on port 5101

Linux: is anything listening on TCP 5101?
sudo ss -tlnp 'sport = :5101'
Linux: UDP 5101
sudo ss -ulnp 'sport = :5101'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5101
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5101 '
Windows (Command Prompt)
netstat -ano | findstr :5101
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5101 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5101
From Windows
Test-NetConnection HOST -Port 5101
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5101

Block port 5101 in the firewall

ufw
sudo ufw deny 5101/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5101 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5101 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5101' -Direction Inbound -Protocol TCP -LocalPort 5101 -Action Block
ufw
sudo ufw deny 5101/udp
iptables
sudo iptables -A INPUT -p udp --dport 5101 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5101 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5101' -Direction Inbound -Protocol UDP -LocalPort 5101 -Action Block

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