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Port 1856 (fiorano-msgsvc)

IANA assigns port 1856 to fiorano-msgsvc: Fiorano MsgSvc.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
fiorano-msgsvc TCP Fiorano MsgSvc Albert Holt 2 -
fiorano-msgsvc UDP Fiorano MsgSvc Albert Holt 2 -

Check what is listening on port 1856

Linux: is anything listening on TCP 1856?
sudo ss -tlnp 'sport = :1856'
Linux: UDP 1856
sudo ss -ulnp 'sport = :1856'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1856
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1856 '
Windows (Command Prompt)
netstat -ano | findstr :1856
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1856 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1856
From Windows
Test-NetConnection HOST -Port 1856
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1856

Block port 1856 in the firewall

ufw
sudo ufw deny 1856/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1856 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1856 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1856' -Direction Inbound -Protocol TCP -LocalPort 1856 -Action Block
ufw
sudo ufw deny 1856/udp
iptables
sudo iptables -A INPUT -p udp --dport 1856 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1856 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1856' -Direction Inbound -Protocol UDP -LocalPort 1856 -Action Block

Related ports

1854buddy-draw1855fiorano-rtrsvc1857datacaptor1858privateark

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