Tools / Hosting
Website Uptime Checker
Check if a website is up, its HTTP status code and response time — instantly. Measures whether your site responds right now from our KEYDAL Istanbul probe, with HTTP status code and response time — ideal early-warning for critical outages.
Every second counts
Uptime is the percentage of time a server or website is reachable. A "good-looking" 99% actually translates to 3 days 15 hours of downtime per year; serious businesses target at least 99.9% SLA, meaning only 8 hours 46 minutes of downtime per year. A 99.99% SLA allows just 52 minutes annually.
This tool performs a single-point, one-shot check — it is not continuous monitoring. A real uptime strategy needs checks from multiple geographies every minute, automated email/SMS alerts and historical reporting. KEYDAL\'s managed hosting plans include 24/7 monitoring and automatic failover.
About uptime checks
A single check only says "right now, from our location". DNS propagation issues, regional BGP outages, routing problems from a specific ISP, or rate-limiting do not surface in a one-off test. Reliable data requires a monitoring service hitting your site from 5+ global probes once per minute.
Most outages happen outside business hours — late-night deploys, crashed cron jobs, expiring SSL certs, DDoS attacks. Without 24/7 monitoring your customer finds out before you do. With automated alerts the Mean Time To Detect (MTTD) stays within minutes; manual spot-checking can take hours.
A year is 365.25 days × 24 hours = 8766 hours. 99.9% uptime = 0.1% allowed downtime = 8.76 hours/year ≈ 43.8 minutes/month. 99.99% is 52.6 minutes/year ≈ 4.38 minutes/month. Always read the fine print of your provider's SLA for exclusions like "scheduled maintenance" — they massively change real availability.
Going from 99.9% to 99.99% drops downtime from 8.76 hours to 52 minutes — roughly 10× reduction. A single server won't cut it: you need multi-AZ deployment, load balancers, automated failover, database replication, redundant DNS and chaos-engineering tests. Costs roughly double, but for e-commerce, fintech and SaaS the saved revenue from avoided outages pays it back quickly.
Let us monitor your site 24/7
Multi-region checks every minute, SMS/email alerts and automated failover — included in every managed hosting plan.
When should you use Website Uptime Checker?
The KEYDAL Website Uptime Checker tool is a browser-based utility that developers, system administrators, SEO specialists and enterprise technology teams use in their daily operations. It requires no installation, is free, and produces results instantly. It is designed so local teams can run audits without connecting to server environments and run analyses without touching production.
Typical scenarios include: post-migration verification, comparing domain or hosting providers, diagnosing customer issues, security auditing (pre-pentest reconnaissance), root-cause analysis of email deliverability problems, validating CDN or proxy configuration, surfacing technical audit data for SEO teams, and rapid information gathering during incident response. You can copy results as text and share them or paste them into internal documentation.
The KEYDAL infrastructure team provides web hosting, VPS, dedicated server management, server hardening, DNS configuration and SSL/TLS deployment services from Türkiye. Beyond these tools, we deliver server setup and operations support across Hetzner, OVHcloud, Contabo, DigitalOcean and Turkish providers.
Your queries are never stored on our servers
KEYDAL tools run stateless: domain names, IPs, URLs or other inputs are not persisted to any database. Logs are kept only for security purposes (rate limiting, abuse detection) and deleted within 30 days. For tools that handle sensitive data (tokens, API keys, JWTs), processing happens entirely in your browser — nothing is sent over the network. See our Privacy Policy for details.
All tools run over HTTPS with TLS 1.3 support. KEYDAL is a Türkiye-based technology company and complies fully with local data-protection regulations (KVKK) and GDPR principles.
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The KEYDAL free tools collection includes DNS lookup, WHOIS lookup, SSL certificate checker, HTTP headers analyzer, IP geolocation, uptime checker, JSON formatter, JWT decoder, Base64 encode/decode, QR code generator, meta tag analyzer and robots.txt tester. All browser-based, free, no installation.
If you are comparing server prices, see our web hosting, VPS, VDS, cloud hosting, dedicated server and storage pages. See all tools →