Is that website down right now, or just you?
Probe any domain or URL instantly from our edge network
Recently Checked Websites
Real-time log of probed sites, current availability, and last checked time (most recent first).
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How ItsUporDown Diagnoses Outages
When you enter a website, our edge probes test DNS resolution, SSL handshakes, and HTTP/HTTPS responses directly from independent cloud servers.
1. DNS & IP Resolution
We query authoritative nameservers to verify if the domain resolves to an active IPv4 or IPv6 address. If nameservers fail, the domain is unreachable worldwide.
2. SSL & TLS Handshake
We verify the secure certificate validity, protocol negotiation (HTTPS/TLS), and certificate expiration to detect security misconfigurations.
3. HTTP Response & Latency
We issue HTTP probes with millisecond resolution timing. Any 5xx code signals an internal crash, while 2xx/3xx confirms operational status.
Common HTTP Status Codes Explained
Understanding what each response code means when checking website availability:
Website is fully operational and responded with complete content payload.
Permanent or temporary redirect (e.g. HTTP to HTTPS or canonical domain).
Server is running, but access is protected by WAF, Cloudflare, or IP rule.
Edge proxy or load balancer cannot reach backend web application servers.
Server is temporarily overloaded, crashed, or down for maintenance.
Domain does not resolve to an IP. Domain expired, typo, or nameserver issue.