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Port 85 (mit-ml-dev)

IANA assigns port 85 to mit-ml-dev: MIT ML Device.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
mit-ml-dev TCP MIT ML Device David Reed -
mit-ml-dev UDP MIT ML Device David Reed -

Check what is listening on port 85

Linux: is anything listening on TCP 85?
sudo ss -tlnp 'sport = :85'
Linux: UDP 85
sudo ss -ulnp 'sport = :85'
Linux / macOS: which process owns the port
sudo lsof -nP -i :85
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':85 '
Windows (Command Prompt)
netstat -ano | findstr :85
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 85 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 85
From Windows
Test-NetConnection HOST -Port 85
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 85

Block port 85 in the firewall

ufw
sudo ufw deny 85/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 85 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 85 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 85' -Direction Inbound -Protocol TCP -LocalPort 85 -Action Block
ufw
sudo ufw deny 85/udp
iptables
sudo iptables -A INPUT -p udp --dport 85 -j DROP
nftables
sudo nft add rule inet filter input udp dport 85 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 85' -Direction Inbound -Protocol UDP -LocalPort 85 -Action Block

Related ports

83mit-ml-dev84ctf86mfcobol87any private terminal link

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