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Port 4596 (ias-neighbor)

IANA assigns port 4596 to ias-neighbor: IAS-Neighbor (ANRI-ANRI).

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ias-neighbor TCP IAS-Neighbor (ANRI-ANRI) David Ott -
ias-neighbor UDP IAS-Neighbor (ANRI-ANRI) David Ott -

Registry dates for this port: registered 2007-07-31.

Check what is listening on port 4596

Linux: is anything listening on TCP 4596?
sudo ss -tlnp 'sport = :4596'
Linux: UDP 4596
sudo ss -ulnp 'sport = :4596'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4596
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4596 '
Windows (Command Prompt)
netstat -ano | findstr :4596
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4596 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4596
From Windows
Test-NetConnection HOST -Port 4596
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4596

Block port 4596 in the firewall

ufw
sudo ufw deny 4596/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4596 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4596 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4596' -Direction Inbound -Protocol TCP -LocalPort 4596 -Action Block
ufw
sudo ufw deny 4596/udp
iptables
sudo iptables -A INPUT -p udp --dport 4596 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4596 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4596' -Direction Inbound -Protocol UDP -LocalPort 4596 -Action Block

Related ports

4594ias-session4595ias-paging4597a21-an-1xbs4598a16-an-an

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