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Port 76 (deos)

IANA assigns port 76 to deos: Distributed External Object Store.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
deos TCP Distributed External Object Store Robert Ullmann -
deos UDP Distributed External Object Store Robert Ullmann -

Check what is listening on port 76

Linux: is anything listening on TCP 76?
sudo ss -tlnp 'sport = :76'
Linux: UDP 76
sudo ss -ulnp 'sport = :76'
Linux / macOS: which process owns the port
sudo lsof -nP -i :76
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':76 '
Windows (Command Prompt)
netstat -ano | findstr :76
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 76 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 76
From Windows
Test-NetConnection HOST -Port 76
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 76

Block port 76 in the firewall

ufw
sudo ufw deny 76/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 76 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 76 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 76' -Direction Inbound -Protocol TCP -LocalPort 76 -Action Block
ufw
sudo ufw deny 76/udp
iptables
sudo iptables -A INPUT -p udp --dport 76 -j DROP
nftables
sudo nft add rule inet filter input udp dport 76 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 76' -Direction Inbound -Protocol UDP -LocalPort 76 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.