Domain Connectivity & DNS Checker – Live HTTP Ping & DoH Resolver
How Browser HTTP Latency Ping & DNS-over-HTTPS (DoH) Work
Traditional command-line ICMP Ping packets measure network layer round-trip time, but web applications operate over TCP, TLS cryptographic handshakes, and HTTP/2 or HTTP/3 multiplexing. This tool tests the genuine application-layer response time experienced by real users.
What is DNS-over-HTTPS (DoH)?
Traditional DNS queries travel in unencrypted plain text over UDP port 53, making them susceptible to ISP interception, DNS cache poisoning, and middlebox manipulation. DNS-over-HTTPS (RFC 8484) encrypts DNS queries inside standard TLS sessions, querying authoritative global Anycast resolvers (Google DNS and Cloudflare) directly from the client.
Diagnosing Website Downtime: "Is It Down Just For Me?"
When a website is inaccessible, determining the root cause is critical:
- Global DNS Outage (NXDOMAIN): The domain name has expired, lacks active nameservers, or has suffered a global DNS configuration failure.
- Local Network Filtering / Firewall: DoH successfully resolves valid A/AAAA IP addresses, but the browser HTTP request times out. This indicates localized ISP blocking, parental controls, or firewall filtering.
- Healthy & Reachable: Both DoH resolution and browser HTTP round-trip handshakes complete with low latency.
Frequently asked questions
Why is browser HTTP ping different from ICMP ping?
ICMP ping measures raw IP echo packets. Browser HTTP ping measures the complete real-world connection pipeline: DNS lookup, TCP 3-way handshake, TLS cryptographic negotiation, and server response (TTFB).
Which DNS record types can I inspect?
You can query A (IPv4 address), AAAA (IPv6 address), CNAME (canonical alias), MX (mail servers with priority), TXT (SPF, DKIM, site verification), and NS (authoritative nameservers).
Does this check DNS propagation?
Yes! By querying global Anycast DNS-over-HTTPS endpoints operated by Cloudflare and Google, you can verify whether newly updated DNS records have propagated across global internet infrastructure.
Manage high-performance Anycast DNS, SSL certificates, and DDoS mitigation with zero downtime.