Welcome to DoNotSpoof

Telecom's leading security database.

We maintain the world's most complete database of numbers used for telecom fraud. Through experience and pattern analysis we have compiled this comprehensive database containing Bank, Telecom, Utility, Police and Governmental numbers frequently used for fraud.

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Constantly Updating

Working hard for your security

Constantly updated we will keep you alerted to bad sources. For example, there are over 300 IRS field offices spoofed for fraud during tax season. We have compiled all of them, and that is just the start.

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Robust API

Get up and running fast

With access to our API you can deploy your own applications and security measures how you need. Let us do the hard work of maintaining this information.

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What We Do?

Fraudulent users spoof telephone numbers of IRS, police, utility companies, banks and governmental agencies in an attempt to trick people in to handing over sensitive information such as bank account, credit card or identity information. We maintain a database of all these sensitive numbers to be a first line of defense against this type of fraud. If you work for one of these institutions we welcome you to contact us to submit your own numbers to this list.

service 1

Added Protection

Reliable call protection.

service 2


Powerful API gives you control.

service 3

Fast Support

We're here for you!

About Us

We are a dedicated team of telecom professionals with years of experience detecting fraud and supporting the industry. Our developers have created tools that are utilized across the industry. We have been guest speakers at fraud conferences, and are responsible for putting a dent in telecom fraud. We keep up to date on fraud trends and new schemes, keeping up with the CFCA and ACFE. We have built a reputation as a reliable source of a wealth of telecom information.

"Simplicity is prerequisite for reliability." --Edsger Dijkstra

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We love our customers and value all their input!

"We use DoNotSpoof to know if the number calling us is frequently used for fraud. Querying their API when a call hits our network lets us know immediately to be on guard."

Mike Carter Help Desk Engineer

"This valuable service has allowed us to query entire CDRs for suspicious patterns and activity. Maintaining our own database was time consuming and required a lot of development and overhead. DoNotSpoof saved us a ton of money and infrastructure and their data is simply the best."

Christopher Reece Security Analyst

"After working with DoNotSpoof, I now see how important it is to keep a security mindset. It has prevented my customers from being scammed by fraudulent sources, and provided an invaluable feature to market to potential customers. Thanks!"

Jered Smith VOIP Technician

"If you have built castles in the air, your work need not be lost; that is where they should be. Now put the foundations under them." --Henry David Thoreau, Walden


Whether you're looking for a few lookups for personal reasons, or a subscription for major queries. We have your needs covered.


  • $1/month
  • Fast Support
  • 40 Daily Queries


  • $0.02/lookup
  • 24/7 Support
  • Unlimited Daily Queries


  • Contact Us
  • Priority Support
  • Unlimited Daily Queries

We Offer Custom Plans. Contact Us For More Info.

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