--- title: "Bulk Uptime Checker — free tool" description: "Free bulk uptime checker. Test if 25 sites are online in one paste. HTTP status, response time, up/down per URL. CSV export." canonical: "https://lemwatch.com/tools/bulk-uptime-check" source: "https://lemwatch.com" --- # Bulk Website Uptime Checker > Check whether up to 25 sites are currently online. Status code, response time, and a per-URL up/down verdict. Bulk uptime checks are the fastest way to triage a 'something is broken' alert across a portfolio. Paste your sites, see who is down, escalate the right one. ## What this tool does We send one HEAD request (falling back to GET if HEAD is blocked) to each URL and record the status code, response time, and any connection-level error. Anything that responds with 2xx or 3xx is up. Anything else is treated as a failure and gets a one-line reason. ## Use cases Incident triage (is it just this site or my whole stack?). Pre-flight checks before a client demo. Post-deploy verification across a multi-tenant app. Health spot-checks during DNS or CDN migrations. ## Important caveat A single 'up' from this tool is not a guarantee of continuous uptime — it is a single-point-in-time check. For real uptime monitoring with 1-minute intervals, multi-region checks, false-positive guards, and incident workflow, sign up for free LemWatch monitoring. ## What this tool checks - HTTP status code per URL - Response time in milliseconds - Up / down verdict (2xx or 3xx = up) - DNS or connection-level errors - TLS handshake failures ## Why it matters When a client reports "the site is down", the first question is "all of them?". Bulk uptime checks answer that in one paste so you triage in seconds, not minutes. ## How to fix what it finds - Any "Down" row needs an incident — open it in the single-URL diagnostic tool - 5xx responses point at the origin server — start there - 4xx responses (404, 410) point at routing or path issues — check recent deploys - Timeouts point at DNS, certificate, or firewall problems — verify the domain resolves and HTTPS works ## Methodology For each URL we issue a HEAD request with a 10-second timeout. If the origin returns 405 Method Not Allowed (some servers do), we retry with GET. We follow up to 3 redirects. The 'up' verdict is true for HTTP 2xx and 3xx; everything else (4xx, 5xx, TCP errors, DNS errors, TLS errors, timeouts) is 'down' with a reason. Response time is measured from the moment we open the TCP connection to the moment we receive the response headers — not full body download time. We do NOT keep the connection open or run multiple samples in bulk mode; for that, use continuous LemWatch monitoring. ## Frequently asked questions ### Does a 200 response mean my site really works? It means the homepage returned a 2xx status to a single bot request. It does not catch JS errors, broken checkouts, or missing images. For depth, use the single-URL Website Uptime Checker. ### Why do some sites show "Down" here but work in my browser? Common causes: WAF blocking unknown user-agents, geo-blocking (the check runs from our edge region), or the site only responds to GET (we retry with GET if HEAD fails). ### Can this replace a monitoring service? No. This is a one-shot snapshot. Real monitoring needs scheduling, multi-region verification, and alerting — that is what LemWatch is for. ### What about TLS errors? TLS failures (expired cert, hostname mismatch) are surfaced as down with a reason. Cross-reference with the Bulk SSL Checker for the full handshake details. ### Does response time include TLS handshake? Yes — we measure from connection open to response headers, which includes TLS negotiation. ### Can I check IP addresses instead of domains? You can paste any URL the underlying fetch supports, but DNS-based checks are recommended (most certs are bound to domain names). ## Related - [All free tools](https://lemwatch.com/tools) - [Website Uptime Checker](https://lemwatch.com/tools/website-uptime) - [Bulk SSL Certificate Checker](https://lemwatch.com/tools/bulk-ssl-checker) - [Bulk DNS Lookup Tool](https://lemwatch.com/tools/bulk-dns-lookup) - [Bulk Mixed Content Checker](https://lemwatch.com/tools/bulk-mixed-content) - [Bulk Broken Link Checker](https://lemwatch.com/tools/bulk-broken-links) - [Lemwatch pricing](https://lemwatch.com/pricing) - [All monitoring checks](https://lemwatch.com/features)