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Port 1848 (fjdocdist)

IANA assigns port 1848 to fjdocdist.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
fjdocdist TCP fjdocdist Yuichi Ohiwa -
fjdocdist UDP fjdocdist Yuichi Ohiwa -

Check what is listening on port 1848

Linux: is anything listening on TCP 1848?
sudo ss -tlnp 'sport = :1848'
Linux: UDP 1848
sudo ss -ulnp 'sport = :1848'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1848
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1848 '
Windows (Command Prompt)
netstat -ano | findstr :1848
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1848 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1848
From Windows
Test-NetConnection HOST -Port 1848
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1848

Block port 1848 in the firewall

ufw
sudo ufw deny 1848/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1848 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1848 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1848' -Direction Inbound -Protocol TCP -LocalPort 1848 -Action Block
ufw
sudo ufw deny 1848/udp
iptables
sudo iptables -A INPUT -p udp --dport 1848 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1848 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1848' -Direction Inbound -Protocol UDP -LocalPort 1848 -Action Block

Related ports

1846tunstall-pnc1847slp-notify1849alpha-sms1850gsi

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