Everything uptime.rs watches for you

Website monitoring

Free website uptime monitoring: every site checked every minute from 6 locations, alerts only when it is really down, response times and 30-day uptime. Unlimited monitors.

SSL certificate monitoring

Get an alert before an SSL certificate expires: we read the certificate of every https monitor daily and warn you 14 days, 3 days and on the day. Free, for every site.

Domain expiry monitoring

Never lose a domain to a missed renewal: daily RDAP and WHOIS checks of every monitored domain, with warnings 30 days, 7 days and on the day it expires. Free.

Status pages

A free, hosted status page for your sites and services: live status, 60-day uptime, incident updates, scheduled maintenance, email subscribers, RSS, badges and your own domain.

Cron job monitoring

Know when a backup, cron job or queue worker stops running: each heartbeat monitor gets a ping URL, and you are alerted when the ping does not arrive on time. Free.

TCP port monitoring

Monitor any TCP service, such as databases, mail servers, SSH or game servers: we open a connection every minute from 6 locations and alert you when it is refused or times out.

Blocklist monitoring

Find out when your domain lands on a phishing blocklist, and when its MX, SPF, DKIM or DMARC records break. Every monitored domain is checked daily, for free.

Downtime alerts

Get downtime alerts by email, Slack, Discord, Telegram, Microsoft Teams, Google Chat, PagerDuty, Opsgenie, Pushover, ntfy, SMS or webhook, grouped so an outage sends one message.

Cloudflare-aware monitoring

Uptime monitoring for sites behind Cloudflare: challenges and "Under Attack" mode are shown as challenged, not down, and errors 52x, 530 and tunnel error 1033 are explained.

Agencies and client reports

Monitor every client site, send monthly uptime reports with your own brand and SMTP server, and give clients access to only their own monitors. Free, unlimited monitors.

API, MCP and AI agents

Let AI agents check if a site is down, read SSL and domain expiry, ping hosts and manage monitors: an MCP server, an agent skill, a free tools API, a REST API and llms.txt.

Website down checker

Enter a domain or URL. We request it right now, follow up to five redirects and show what came back.

SSL checker

Enter a domain (add :port for another port). We connect, read the certificate and check whether browsers would accept it.

Domain expiry checker

Enter a domain. We ask its registry: RDAP where there is one, WHOIS otherwise.

Ping and port checker

Enter a host or IP, with :port if you like (443 by default). We open four TCP connections and time each one.