Port 211 (914c-g, 914c/g)

IANA assigns port 211 to 914c-g, 914c/g: Texas Instruments 914C/G Terminal IANA assigned this well-formed service name as a replacement for "914c/g"..

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

914c-g TCP Texas Instruments 914C/G Terminal IANA assigned this well-formed service name as a replacement for "914c/g". Bill Harrell -

914c/g TCP Texas Instruments 914C/G Terminal
This entry is an alias to "914c-g". This entry is now historic, not usable for use with many common service discovery mechanisms. Bill Harrell -

914c-g UDP Texas Instruments 914C/G Terminal IANA assigned this well-formed service name as a replacement for "914c/g". Bill Harrell -

914c/g UDP Texas Instruments 914C/G Terminal
This entry is an alias to "914c-g". This entry is now historic, not usable for use with many common service discovery mechanisms. Bill Harrell -

Check what is listening on port 211

Linux: is anything listening on TCP 211?

sudo ss -tlnp 'sport = :211'

Linux: UDP 211

sudo ss -ulnp 'sport = :211'

Linux / macOS: which process owns the port

sudo lsof -nP -i :211

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':211 '

Windows (Command Prompt)

netstat -ano | findstr :211

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 211 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine

nc -vz -w 5 HOST 211

From Windows

Test-NetConnection HOST -Port 211

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 211

Block port 211 in the firewall

ufw

sudo ufw deny 211/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 211 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 211 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 211' -Direction Inbound -Protocol TCP -LocalPort 211 -Action Block

ufw

sudo ufw deny 211/udp