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Port 20057 (avesterra)

IANA assigns port 20057 to avesterra: AvesTerra Hypergraph Transfer Protocol (HGTP).

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
avesterra TCP AvesTerra Hypergraph Transfer Protocol (HGTP) Georgetown University -

Registry dates for this port: registered 2016-06-06.

Check what is listening on port 20057

Linux: is anything listening on TCP 20057?
sudo ss -tlnp 'sport = :20057'
Linux / macOS: which process owns the port
sudo lsof -nP -i :20057
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':20057 '
Windows (Command Prompt)
netstat -ano | findstr :20057
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 20057 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 20057
From Windows
Test-NetConnection HOST -Port 20057

Block port 20057 in the firewall

ufw
sudo ufw deny 20057/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 20057 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 20057 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 20057' -Direction Inbound -Protocol TCP -LocalPort 20057 -Action Block

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