Internet
Speed test, ping, DNS, IP & network checks
Test your internet connection and look up anything about a network from your browser: download and upload speed, ping, jitter and packet loss, DNS records and propagation, your public IP address and WebRTC leaks, subnet ranges. Each result comes with an explanation of what the number means and what to do when it is not good.
Measure download, upload, latency, jitter and bufferbloat in your browser. See whether your line is fast enough for 4K, Zoom and gaming.
Measure browser ping to a nearby edge or selected AWS regions. Shows median, p95, jitter, timeouts and the fibre-distance floor.
Measure jitter twice in the browser: at idle and under load. Shows jitter increase, loaded latency, bufferbloat and voice or gaming suitability.
Find packet-loss signals from the browser: request timeouts plus server-side TCP retransmission, with clear notes on what a browser can and cannot see.
Look up DNS records with six public resolvers. Inspect TTL, DNSSEC flags, mail records and reverse DNS, then copy a zone file or raw JSON.
Compare DNS records across six public resolvers, check expected values and remaining TTL, and monitor changes with optional repeat checks.
Inspect SPF lookup chains, DKIM public keys, DMARC policy and MX records. Get a transparent DNS configuration score and practical diagnostics.
See your public IPv4 and IPv6 address instantly. Country, nearest CDN and VPN status are shown free; ISP and city are looked up only when you ask.
Look up any IP address or domain: ISP, AS number, country, city and reverse DNS. Private and reserved ranges are explained instantly, without a lookup.
Compare HTTPS and WebRTC addresses using two STUN providers. Inspect IPv4, IPv6 and local candidates without microphone or camera permissions.
Enter an IP and prefix to get network and broadcast addresses, host range, netmask, wildcard, reverse DNS name and a subnet split table — IPv4 and IPv6.
See your browser, version, OS, screen, time zone and feature support — everything a website can read about you. Nothing is sent anywhere; there is no server.