Availability Diagnostic Tool Free Tier · 30 req/min

Website Availability & Status Checker

Verify real-time HTTP/HTTPS reachability, server response status codes, and origin availability for any public domain or IP address.

Sample queries: example.com · google.com · cloudflare.com

Availability Status for example.com

Real tool output fetched via live HTTP/HTTPS reachability check · 2026-10-26 20:58:46 EDT

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Reachability

Online & Answering

Port 80/443 handshake

HTTP Response Code

200

OK (200)

Host / Endpoint

example.com

Public target

Raw Reachability Diagnostics

Host:        example.com
Status:      UP
HTTP Code:   200
Message:     OK (200)

HTTP Status Code Classes

HTTP response codes indicate whether a web server is reachable and serving requests normally: 2xx indicates success, 3xx indicates redirection, 4xx indicates client/resource errors, and 5xx indicates origin server or gateway failures.

DNS vs. Origin Reachability

When a website appears unreachable, the root cause may be either failed DNS resolution (missing A/AAAA records or expired domain registration) or an unresponsive web server on ports 80 and 443.

Redirect Verification

The status checker safely follows up to 3 redirect hops (such as HTTP to HTTPS or apex to www) while validating resolved destination IP addresses against SSRF and rebinding risks.

Frequently Asked Questions

How does the Website Status Checker determine if a site is up?

The tool resolves the domain's authoritative A and AAAA DNS records, verifies that all resolved addresses are public routable IPs, and performs a live HTTP/HTTPS request on port 80 or 443. Responses in the 200–399 range after redirects are reported as UP.

Why might a website report DOWN even if it loads in my browser?

Some origin firewalls or edge WAF providers present HTTP 403/503 bot challenges to automated datacenter requests, or your browser may be rendering a cached local copy while DNS changes are propagating.

What is the rate limit for website status checks?

Free interactive checks are limited to 30 requests per minute per IP address.