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Port 2102 (zephyr-srv)

IANA assigns port 2102 to zephyr-srv: Zephyr server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
zephyr-srv TCP Zephyr server - -
zephyr-srv UDP Zephyr server - -

Check what is listening on port 2102

Linux: is anything listening on TCP 2102?
sudo ss -tlnp 'sport = :2102'
Linux: UDP 2102
sudo ss -ulnp 'sport = :2102'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2102
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2102 '
Windows (Command Prompt)
netstat -ano | findstr :2102
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2102 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2102
From Windows
Test-NetConnection HOST -Port 2102
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2102

Block port 2102 in the firewall

ufw
sudo ufw deny 2102/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2102 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2102 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2102' -Direction Inbound -Protocol TCP -LocalPort 2102 -Action Block
ufw
sudo ufw deny 2102/udp
iptables
sudo iptables -A INPUT -p udp --dport 2102 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2102 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2102' -Direction Inbound -Protocol UDP -LocalPort 2102 -Action Block

Related ports

2100amiganetfs2101rtcm-sc1042103zephyr-clt2104zephyr-hm

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