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Port 2156 (trp)

IANA assigns port 2156 to trp: Talari Reliable Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
trp TCP Talari Reliable Protocol John E Dickey -
trp UDP Talari Reliable Protocol John E Dickey -

Registry dates for this port: registered 2007-09-27.

Check what is listening on port 2156

Linux: is anything listening on TCP 2156?
sudo ss -tlnp 'sport = :2156'
Linux: UDP 2156
sudo ss -ulnp 'sport = :2156'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2156
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2156 '
Windows (Command Prompt)
netstat -ano | findstr :2156
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2156 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2156
From Windows
Test-NetConnection HOST -Port 2156
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2156

Block port 2156 in the firewall

ufw
sudo ufw deny 2156/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2156 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2156 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2156' -Direction Inbound -Protocol TCP -LocalPort 2156 -Action Block
ufw
sudo ufw deny 2156/udp
iptables
sudo iptables -A INPUT -p udp --dport 2156 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2156 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2156' -Direction Inbound -Protocol UDP -LocalPort 2156 -Action Block

Related ports

2154stdptc2155brdptc2157xnds2158touchnetplus

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