numlookupapi.com

Numlookupapi is a phone-number validation and metadata service for developers building call-screening, routing, or fraud workflows. It is a better fit for software that needs number signals across countries than for anyone trying to identify a caller. Its batch lookups and developer integrations help, but carrier and location results may be empty.

The service can add useful context to a number, but it cannot tell you who is behind it. For modest usage, the free tier is a practical starting point; production workloads will need a paid plan, with the right choice depending on monthly volume and team controls.

Overview

Numlookupapi provides a JSON REST API for validating phone numbers and looking up data across more than 230 countries. A lookup can return country, location, carrier, line type, and time zone, as well as E.164 and national formats and a tel: link for click-to-call. That makes it useful for normalizing numbers and adding routing or screening signals without building a lookup layer from scratch.

It is not a reverse-identity service: the API does not return a person’s name or address. Carrier and location can also be empty, so those fields should be treated as potentially useful signals, not guaranteed results. The pricing FAQ says the data comes from several phone data providers and international carriers, and reports 99.99% API uptime over the preceding 12 months. A status page provides current service status.

Key features

Validation and line-type data

The service identifies mobile, landline, toll-free, premium-rate, satellite, VoIP, shared-cost, personal, and UAN numbers. That range can help a contact center route calls by number type or a lead system flag numbers for review. It does not, on its own, establish caller identity or prove that a number is reachable.

Batch lookups and developer access

Numlookupapi accepts up to 100 numbers in one request, which can reduce overhead for applications processing lists rather than single submissions. Official SDKs for JavaScript, Ruby, PHP, and Python provide language-specific entry points, and the documentation links to a Postman collection. Developers can use HTTP API access with API-key authentication in headers or GET parameters; a hosted MCP server is also offered for AI agents.

Reliability, privacy, and support

The reported 99.99% uptime over the preceding 12 months is a useful availability signal for workflows that depend on lookups, though a historical figure does not guarantee future uptime. The privacy policy describes technical and organizational measures to prevent unauthorized access, alteration, disclosure, or destruction of personal data. It also says the site may collect names and email addresses and use cookies, and outlines GDPR rights including access, correction, deletion, and portability.

The maker says technical support questions receive an actionable reply within 24 hours. That stated response target may suit teams that need help integrating the API, while the plan chosen determines whether support is email or tailored.

Pricing

Numlookupapi uses a freemium model. The free plan is billed at $0.00 /mo and includes 100 requests, batch validation, one API key, and a limit of 10 requests per minute. It is enough to evaluate an integration or handle very light use, but the monthly allowance is quickly exhausted in a live screening or routing workflow.

Basic is the entry point for recurring use: its 5,000-request monthly cap matches the published monthly lookup limit, and it removes the free plan’s rate ceiling. It keeps you to one API key and does not include team management or sandbox keys, so it is best for a single integration with moderate volume. Pro costs more but raises the quota tenfold and adds a second key, sandbox access, and team management, making it the more practical fit for a small team with separate testing and production needs.

Scale is aimed at higher-volume services that need more access controls and contractual support: it provides five keys, tailored support, an SLA, and overages alongside 250,000 requests. Custom pricing is the route for requirements beyond those preset terms, including custom volume, key count, and SLA. The paid plans have no rate limit; quotas and the specific included controls still differ.

Platforms

Numlookupapi supports API and web access. The API is the central option for product integrations, while the web platform gives users a browser-based route to the service. SDKs and API-key authentication provide practical integration choices for developers.

Who it's for

Numlookupapi is best suited to developers and teams that need phone-number validation and metadata as part of inbound call screening, contact-center routing, lead handling, or fraud-signal workflows. It is especially relevant when the application needs to process batches or distinguish among a broad range of line types. It is not the right choice for identifying a caller by name or address, and teams that rely on carrier or location data should account for the possibility of empty results.

Pros and cons

• Broad international coverage: Lookups span 230+ countries and return several useful number attributes, supporting applications with cross-border users.
• Batch support: Up to 100 numbers per request suits list processing and reduces the need to submit every number individually.
• Developer options: SDKs for four languages, HTTP access, a Postman collection, and an MCP server give teams multiple integration paths.
• Low-cost paid entry: Basic starts at $9.99 /mo for 5,000 monthly requests and removes rate limits, but it provides only one API key and no team-management or sandbox features.
• Small free allowance: The 100-request monthly cap and 10-requests-per-minute limit make the free plan suitable for evaluation or very light use, not sustained production traffic.
• Metadata is not guaranteed: Carrier and location may be empty, and the API does not return the caller’s identity, limiting its use as a standalone fraud or identity check.

Alternatives

For a broader comparison of products in this category, see Phone Number Validation Software.

• Veriphone is worth comparing if a larger free monthly allowance matters: its free plan includes 1,000 validations per month, full carrier and line-type data, and bulk CSV and API access.
• PhoneValidationAPI may suit readers who want a 6,000-request monthly entry plan; its Basic plan costs $14.99 /month and includes standard email support.
• IPQualityScore Phone Validation API is another freemium option, with 1,000 free lookups per month and tiered flat-rate monthly volume pricing without monthly contracts.
• Numverify is an alternative phone-number lookup API.
• Twilio Lookup is an API alternative with free formatting and validation, plus separately priced line-status queries.
• libphonenumber-js is a free open-source JavaScript/TypeScript library under MIT and Apache-2.0 licenses, making it a different route for teams seeking a library rather than a hosted lookup service.
• Accessibility Test Framework for Android is a free Android accessibility testing framework and is not a phone-number lookup substitute.
• Abstract Email Validation API focuses on email validation rather than phone-number lookup.

Verdict

Choose Numlookupapi if your application needs international phone-number validation, batch processing, and line-type or carrier signals through an API, and the Basic or higher monthly quota fits your traffic. Its broad number-type coverage and developer integration options are the main reasons to choose it. Look elsewhere if your priority is caller identity, guaranteed carrier or location fields, or a larger free allowance.