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Port 698 (olsr)

IANA assigns port 698 to olsr: OLSR.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
olsr TCP OLSR Thomas Clausen -
olsr UDP OLSR Thomas Clausen -

Check what is listening on port 698

Linux: is anything listening on TCP 698?
sudo ss -tlnp 'sport = :698'
Linux: UDP 698
sudo ss -ulnp 'sport = :698'
Linux / macOS: which process owns the port
sudo lsof -nP -i :698
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':698 '
Windows (Command Prompt)
netstat -ano | findstr :698
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 698 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 698
From Windows
Test-NetConnection HOST -Port 698
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 698

Block port 698 in the firewall

ufw
sudo ufw deny 698/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 698 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 698 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 698' -Direction Inbound -Protocol TCP -LocalPort 698 -Action Block
ufw
sudo ufw deny 698/udp
iptables
sudo iptables -A INPUT -p udp --dport 698 -j DROP
nftables
sudo nft add rule inet filter input udp dport 698 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 698' -Direction Inbound -Protocol UDP -LocalPort 698 -Action Block

Related ports

696rushd697uuidgen699accessnetwork700epp

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