HTTPfy

Port 311 (asip-webadmin)

IANA assigns port 311 to asip-webadmin: AppleShare IP WebAdmin.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
asip-webadmin TCP AppleShare IP WebAdmin Ann Huang -
asip-webadmin UDP AppleShare IP WebAdmin Ann Huang -

Check what is listening on port 311

Linux: is anything listening on TCP 311?
sudo ss -tlnp 'sport = :311'
Linux: UDP 311
sudo ss -ulnp 'sport = :311'
Linux / macOS: which process owns the port
sudo lsof -nP -i :311
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':311 '
Windows (Command Prompt)
netstat -ano | findstr :311
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 311 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 311
From Windows
Test-NetConnection HOST -Port 311
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 311

Block port 311 in the firewall

ufw
sudo ufw deny 311/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 311 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 311 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 311' -Direction Inbound -Protocol TCP -LocalPort 311 -Action Block
ufw
sudo ufw deny 311/udp
iptables
sudo iptables -A INPUT -p udp --dport 311 -j DROP
nftables
sudo nft add rule inet filter input udp dport 311 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 311' -Direction Inbound -Protocol UDP -LocalPort 311 -Action Block

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