Real Estate

Is CoStar Down?

CoStar is a real estate service.

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CoStar is UP

CoStar is reachable from our servers. It responded with HTTP 403 in 144ms. If you cannot access it, the issue is likely on your end — try clearing your cache, flushing DNS, or switching networks.

Response: 144ms

Status: HTTP 403

Checked: Tue, 28 Apr 2026 10:03:13 GMT

From: Cloudflare Edge

Site: costar.com ↗

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@costar on X ↗ — real-time updates during outages

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About CoStar outages

CoStar (costar.com) is a real estate service. CoStar is a real estate service.

Common causes of CoStar outages include server overload, DNS failures, DDoS attacks, software deployments, CDN issues, and infrastructure failures. Most outages resolve within minutes to a few hours.

If CoStar is down for everyone: Check their official status page and social media for updates.

If CoStar is up but not working for you: Try clearing your browser cache, disabling your VPN, flushing DNS, or switching networks.