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Port 1902 (fjicl-tep-b)

IANA assigns port 1902 to fjicl-tep-b: Fujitsu ICL Terminal Emulator Program B.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
fjicl-tep-b TCP Fujitsu ICL Terminal Emulator Program B Bob Lyon -
fjicl-tep-b UDP Fujitsu ICL Terminal Emulator Program B Bob Lyon -

Check what is listening on port 1902

Linux: is anything listening on TCP 1902?
sudo ss -tlnp 'sport = :1902'
Linux: UDP 1902
sudo ss -ulnp 'sport = :1902'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1902
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1902 '
Windows (Command Prompt)
netstat -ano | findstr :1902
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1902 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1902
From Windows
Test-NetConnection HOST -Port 1902
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1902

Block port 1902 in the firewall

ufw
sudo ufw deny 1902/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1902 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1902 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1902' -Direction Inbound -Protocol TCP -LocalPort 1902 -Action Block
ufw
sudo ufw deny 1902/udp
iptables
sudo iptables -A INPUT -p udp --dport 1902 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1902 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1902' -Direction Inbound -Protocol UDP -LocalPort 1902 -Action Block

Related ports

1900SSDP / UPnP1901fjicl-tep-a1903linkname1904fjicl-tep-c

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