The Industry's Most Comprehensive Do Not Originate Dataset

RealNumber DNO Helps Providers Mitigate Fraud and Support Compliance

Ensure FCC Compliance for DNO Regulations Ahead of the December 15, 2025 Enforcement

Illegal and unwanted traffic isn’t just a nuisance; it’s now a clear regulatory risk.

With the new Federal Communications Commission (FCC) enforcement deadline of December 15, 2025, all service providers must act quickly to ensure compliance, including the use of a “reasonable” Do Not Originate (DNO) list to block spoofed, invalid or high-risk numbers before they ever initiate a call or text.

That is where RealNumber® DNO comes in. It is the industry’s most comprehensive and trusted DNO dataset, purpose-built to help providers stay compliant, reduce fraud and prepare for upcoming enforcement.

Your One-Stop-Shop to Ensure FCC Compliance for DNO Regulations Ahead of the December 15, 2025 Enforcement Deadline

See How RealNumber DNO Helps You Stay Compliant

With its robust Toll-Free and local number dataset of over 6 billion numbers, RealNumber DNO is the industry’s most comprehensive DNO list, helping you to stay ahead of compliance, safeguard your customers and stop fraudulent traffic before it starts.

Partnering with Somos to implement RealNumber DNO has been a game-changer for Directo. It has proven to be an invaluable asset in our fight against fraud, delivering a clear ROI and enhancing the quality of service we provide to our customers.

René Brun, VP Global Carrier Services of Directo

RealNumber DNO has helped with our desire to maintain a robust process to identify and eliminate unwanted traffic.

David Gipner, VP of Business Development at ANI Networks

Since implementation, RealNumber DNO has helped us stop a meaningful volume of unlawful or unwanted traffic in our network.

Stacy Graham, Trust & Assurance Policy Director at Sinch

The decision to integrate RealNumber DNO has proven to be a game-changer!

Martin L. Potia, COO of All Access Telecom

Do Not Originate By The Numbers

The most comprehensive set of DNO numbers (and growing!) available to help stop fraudulent traffic in its tracks!

Toll-Free DNO Numbers

Identified as DNO for voice which should never be used for call origination

Local DNO Numbers

Identified as DNO for voice which should never be used for call origination

Subscriber Set DNO numbers

Manually entered by Resp Orgs and Service Provider Identification Number (SPID) owners

Toll-Free DNO for Text

Identified as DNO for text which should never be used for text origination

RealNumber DNO Use Cases

Preventing Spoofed Calls

By blocking calls that appear to originate from numbers in the RealNumber DNO database, telecom providers can reduce the volume of spoofed calls that exploit unallocated or unused numbers to impersonate legitimate callers.

Mitigating Fraudulent Activities

Fraudsters often use numbers that aren’t in service to disguise their identities. RealNumber DNO allows carriers to identify and block calls from these numbers, protecting end users from scams such as robocalls, phishing attempts and other forms of fraud.

Protecting Brand Reputation for Businesses

By ensuring that their brand’s numbers are not spoofed by fraudsters, businesses protect their reputation and customer trust. Many companies also register numbers they don’t use for outbound calling to the RealNumber DNO dataset, minimizing the chance of these numbers being misused for spoofing.

Adhere to Regulatory Compliance

RealNumber DNO supports the STIR/SHAKEN initiative and increasing regulatory focus on combating illegal robocalls and robotexts by blocking calls and texts from numbers that shouldn’t originate traffic. This helps to build consumer trust in telecom systems.

Improving Contact Center Efficiency

Contact centers can use RealNumber DNO to help their agents identify potentially fraudulent numbers before answering a phone call. It helps to streamline operations, reduce queue sizes and allow agents to focus on legitimate customers while helping protect agents from fraud.

Safeguarding Sensitive Communications

Industries like finance, healthcare and government can rely on the RealNumber DNO dataset to protect the integrity of communications by ensuring that critical alerts, notifications and other communications are not vulnerable to spoofing from fraudulent numbers.

combat spoofing prevent fraud brand protection Compliance boost efficiency secure comms

It's all about the data!

RealNumber DNO is the ONLY DNO list that comes directly from the trusted administrator of the North American Numbering Plan (NANP) and the TFNRegistry™.

Auto Set

Numbers that are automatically entered into the DNO database. The Toll-Free and 10-digit numbers included in this data set are procured directly from three authoritative sources: the TFNRegistry™ and the NANP combined with NPAC.

Subscriber Set

Toll-Free and local 10-digit numbers that are manually entered by Resp Orgs and Service Provider Identification Number (SPID) owners which should never be used for call or text origination.

ITG Number Set

Industry Traceback Group (ITG) Number Set that have been thoroughly vetted and identified as numbers spoofed to facilitate illegal, fraudulent, or otherwise malicious traffic.

RealNumber DNO At-a-Glance

Unmatched Number Visibility

The only solution in the market that provides visibility into over 6 billion Toll-Free and 10-digit local (and counting!) numbers that have already been identified as DNO for voice.

Avoid Costly Fines

RealNumber DNO can help to protect against costly fees and fines for non-compliance of recent FCC regulations for both voice and text traffic.

Stronger Robocall Mitigation

Help harden your Robocall Mitigation Strategy and comply with FCC regulations aimed at safeguarding consumers against the unlawful practice of voice and text spoofing.

Stop Illegal Texts at the Source

Access to over 35 million Toll-Free Numbers identified as DNO for text not only to keep your messaging networks free from unwanted and illegal text messages but ALSO comply with upcoming enforcement of FCC regulations.

Support for Every Provider

Supports Gateway Providers and U.S.-based operators in identifying numbers which should never be used for call origination – making this your one-stop shop compliance solution for recent FCC regulations.

Easy API Integration

Available via API for simple and efficient implementation to ensure you have the most up-to-date information possible.

Flexible Subscription Options

Fully customizable subscription! Whether you need to query a single number or 100 million numbers, the RealNumber team is ready to work with you to find a package that fits your needs and helps you stay in compliance!

Expert Support, Anytime

Connect with our dedicated support team - 24/7 - to answer any of your RealNumber DNO questions.

Trusted Partners

Authorized Distributors offering RealNumber DNO access to help mitigate fraud and comply with regulatory requirements:

The Stats Don't Lie!

1B Calls per day compared against the RealNumber DNO dataset

17% A Gateway Provider identified a 17% hit rate upon implementation

90% A leading wireless provider saw a 90% reduction in customer reported robocalls when coming from a provider who has implemented DNO

Questions about RealNumber? Check out the FAQs below:

FAQs

What is RealNumber DNO?

RealNumber DNO is helping to bring back trust in telephony – one number at a time. And with its robust Toll-Free and 10-digit local number dataset, the solution has shown itself to be a powerful tool in protecting valuable number assets and safeguarding networks.

RealNumber DNO is the key to helping providers comply with the upcoming enforcement of regulations to block calls and texts from numbers that should never originate traffic.

This solution offers a one-stop-shop that is comprehensive, affordable, and user-friendly. See firsthand how RealNumber DNO not only keeps your networks free from unwanted and illegal traffic but also helps you to stay in compliance!

 What are the benefits of RealNumber DNO?

Fraud prevention: It helps telecom providers block traffic from numbers that should never originate calls or texts, protecting end users from scams and spoofing.

Compliance: It can help to protect against costly fees and fines for non-compliance of recent FCC regulations for both voice and text traffic.

Brand protection: By filtering out unwanted calls and texts, it helps maintain the integrity of the business's communication channels, enhancing consumer trust, call authenticity and reputation.

Operational efficiency: By blocking invalid or fraudulent calls, it streamlines operations in environments like contact centers, reducing queue sizes and allowing agents to focus on legitimate customers, while helping protect agents from fraud.

How many numbers are in the RealNumber DNO dataset?

RealNumber DNO is the industry’s most comprehensive DNO dataset. With over 6 billion Toll-Free and 10-digit local (and counting!) numbers that have already been identified as DNO for voice, it’s a one-stop-shop to help stop fraudulent traffic in its tracks!

You also gain access to over 35 million Toll-Free Numbers identified as DNO for text to not only to keep your messaging networks free from unwanted and illegal text messages but also help you comply with recent enforcement of FCC regulations.

What type of data is available with RealNumber DNO?

RealNumber DNO is the only DNO list that comes direct from the trusted administrator of the North American Numbering Plan (NANP) and the TFNRegistry™. This dataset includes numbers that are invalid, unallocated or inactive and numbers manually entered by Resp Orgs and Service Providers Identification Number (SPID) owners which should never be used for call or text origination; as well as the Industry Traceback Group (ITG) Number set that have been thoroughly vetted and identified as numbers spoofed to facilitate illegal, fraudulent or otherwise malicious traffic.

How do I subscribe to RealNumber DNO?

RealNumber DNO is a fully customizable subscription! Whether you need to query a single number or 100 million numbers, the RealNumber team is ready to work with you to find a package that fits your needs and helps you stay in compliance! Reach out to connect@somos.com and a Somos team member will be in touch.

How do I access the RealNumber DNO solution?

RealNumber DNO can be accessed by navigating to realnumber.somos.com using a web browser. If you are a Resp Org, You will be able to log in using your TFNRegistry™ credentials to manage DNO on your numbers. SPID holders can reach out for access to manage their local numbers. The RealNumber DNO lists are available in the UI or via an API for simple and efficient implementation to ensure you have the most up-to-date information possible. Access to the DNO Lists requires a subscription.

How can I learn more about RealNumber DNO?

If you are interested in learning more about how you can use RealNumber DNO to stay ahead of the fraudsters and stop illegal and unwanted voice or text traffic, reach out to connect@somos.com and a Somos team member will be in touch.

Interested in Learning More About RealNumber DNO?

Stay ahead of the fraudsters and stop illegal and unwanted voice or text traffic. RealNumber® DNO is the key to helping comply with the upcoming enforcement of FCC regulations to block calls and texts from numbers that do not originate traffic!