Azure IP Address Lookup | Check Service Tags

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Common Use Cases

Network Review

Review addresses referenced in firewall rules, allowlists, routing changes, and architecture assessments.

Traffic Analysis

Check addresses from access and flow logs to understand whether traffic is associated with Azure Public Cloud ranges.

Incident Triage

Add Azure service tag and region context to security alerts and mitigation logs.

Frequently Asked Questions

Why can one address match multiple service tags?

Azure prefixes overlap by design. One address can match a service-specific tag, its regional variant, a regional AzureCloud tag, and the global AzureCloud tag. The most specific match uses the narrowest prefix and most specific regional scope returned by the lookup.

How are domain names and URLs handled?

A URL is reduced to its hostname. The lookup service resolves the hostname and checks the resulting address against Azure Public Cloud service tags. DNS answers can change by location and time, so repeating a domain lookup can produce different results.

Does the lookup support IPv6 addresses?

Yes. The tool accepts IPv4, IPv6, domain names, and HTTP/HTTPS URLs. IPv6 prefixes are displayed in the notation returned by the lookup API.

Can I automate lookups?

Yes. Send a GET request to /api/ipAddress?ipOrDomain=<ipAddressOrDomain>. Encode the query value and handle rate limits, timeouts, and transient failures in automated clients.