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Port 7800 (asr)

IANA assigns port 7800 to asr: Apple Software Restore.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
asr TCP Apple Software Restore
Defined TXT keys: image=<HTTP URL of disk image> Jim Kateley, Shantonu Sen -
asr UDP Apple Software Restore
Defined TXT keys: image=<HTTP URL of disk image> Jim Kateley, Shantonu Sen -

Registry dates for this port: registered 2006-01.

Check what is listening on port 7800

Linux: is anything listening on TCP 7800?
sudo ss -tlnp 'sport = :7800'
Linux: UDP 7800
sudo ss -ulnp 'sport = :7800'
Linux / macOS: which process owns the port
sudo lsof -nP -i :7800
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':7800 '
Windows (Command Prompt)
netstat -ano | findstr :7800
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 7800 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 7800
From Windows
Test-NetConnection HOST -Port 7800
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 7800

Block port 7800 in the firewall

ufw
sudo ufw deny 7800/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 7800 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 7800 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 7800' -Direction Inbound -Protocol TCP -LocalPort 7800 -Action Block
ufw
sudo ufw deny 7800/udp
iptables
sudo iptables -A INPUT -p udp --dport 7800 -j DROP
nftables
sudo nft add rule inet filter input udp dport 7800 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 7800' -Direction Inbound -Protocol UDP -LocalPort 7800 -Action Block

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