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Network & IP tools

Inspect your public connection, routing evidence and service reachability. Registry country is not precise geolocation, route visibility is not an uptime test, and a TCP timeout does not prove that a port is closed.

Choose a check

Begin with your public IP and connection details for a local network question. Use ASN and BGP lookups to inspect network ownership and observed routes. For a service problem, choose a bounded port or TCP connection check and compare its measurement location with the affected user.

Tools in this collection

    • See the public address your connection presents to the internet.
    • What is my public IP address?
    • Am I connecting over IPv4 or IPv6?
    • Setting up an allowlist? Copy your current IP.
    • VPN on? Check which address sites see.

    See your public IP, whether you are on IPv4 or IPv6, and test IPv6.

  • My Connection Info

    Runs on server
    • See how your browser actually connects, beyond the Wi-Fi signal.
    • Which TLS version and cipher does your browser use?
    • Is your connection on HTTP/2 or HTTP/3?
    • Slow site? See the round-trip time from your browser.
    • Testing HTTP/3 support? See whether your browser negotiates it.

    See your TLS version, cipher, HTTP/2 or HTTP/3 and round-trip time.

  • ASN Lookup

    Runs on server
    • An unfamiliar IP in your logs? Find the network announcing it.
    • Who owns this IP? Find the network that announces it.
    • Seeing abuse from a range? Find its registered owner.
    • Look up an AS number and the organisation behind it.
    • Blocking a range? Check which network you would be blocking.

    Find the network (ASN) that announces an IP and who it is registered to.

  • BGP Route Lookup

    Runs on server
    • Investigate routing changes when a network becomes hard to reach.
    • Network unreachable? Check whether its routes are visible.
    • Suspect a hijack or leak? See the origins of a prefix.
    • See which prefixes an ASN announces.
    • Look up recent BGP incidents for an IP or domain.

    Inspect routes for a domain, IP, prefix or ASN: origins, visibility and BGP incidents.

  • Open Port Checker

    Runs on server
    • Set up port forwarding? Check whether the internet can reach your port.
    • Set up port forwarding? Check the port is reachable.
    • Hosting a game server? Confirm others can connect.
    • Firewall change? Confirm a port is now closed.
    • Router or ISP blocking? Test from outside your network.

    Check whether a port on your own IP is reachable from the internet.

  • TCP Ping

    Runs on server
    • A service works for you but not elsewhere? Compare connections from three regions.
    • Works for you, not for others? Test from three regions.
    • Check whether a port answers from outside your network.
    • Compare connection latency between regions.
    • Firewall rule for one region? Confirm it applies.

    Test TCP connections to a host and port from three regions at once.

    • Friends can't join your Minecraft server? Check its public status.
    • Is the server online? Check its public status.
    • See how many players are online right now.
    • High lag? Check the ping to the server.
    • Using a custom domain? Check its SRV record resolves.

    Check whether a Minecraft Java server is online, its players and ping.