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Port 3212 (surveyinst)

IANA assigns port 3212 to surveyinst: Survey Instrument.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
surveyinst TCP Survey Instrument Al Amet -
surveyinst UDP Survey Instrument Al Amet -

Check what is listening on port 3212

Linux: is anything listening on TCP 3212?
sudo ss -tlnp 'sport = :3212'
Linux: UDP 3212
sudo ss -ulnp 'sport = :3212'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3212
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3212 '
Windows (Command Prompt)
netstat -ano | findstr :3212
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3212 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3212
From Windows
Test-NetConnection HOST -Port 3212
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3212

Block port 3212 in the firewall

ufw
sudo ufw deny 3212/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3212 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3212 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3212' -Direction Inbound -Protocol TCP -LocalPort 3212 -Action Block
ufw
sudo ufw deny 3212/udp
iptables
sudo iptables -A INPUT -p udp --dport 3212 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3212 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3212' -Direction Inbound -Protocol UDP -LocalPort 3212 -Action Block

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