Port 5585 (bis-sync)

IANA assigns port 5585 to bis-sync: BeInSync-sync.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

bis-sync TCP BeInSync-sync Adi Ruppin -

bis-sync UDP BeInSync-sync Adi Ruppin -

Registry dates for this port: registered 2005-08.

Linux: is anything listening on TCP 5585?

sudo ss -tlnp 'sport = :5585'

Linux: UDP 5585

sudo ss -ulnp 'sport = :5585'

Linux / macOS: which process owns the port

sudo lsof -nP -i :5585

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':5585 '

Windows (Command Prompt)

netstat -ano | findstr :5585

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5585 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 5585

From Windows

Test-NetConnection HOST -Port 5585

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 5585

ufw

sudo ufw deny 5585/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 5585 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 5585 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 5585' -Direction Inbound -Protocol TCP -LocalPort 5585 -Action Block

ufw

sudo ufw deny 5585/udp

iptables

sudo iptables -A INPUT -p udp --dport 5585 -j DROP

nftables

sudo nft add rule inet filter input udp dport 5585 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 5585' -Direction Inbound -Protocol UDP -LocalPort 5585 -Action Block

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