NUSO, LLC is a cloud phone company that sells business phone service and numbers through resellers.
NUSO is a cloud communications company: it runs its own phone network and sells business phone service, phone lines for office phone systems and phone numbers. It sells mostly through partners, such as phone resellers and IT providers, which offer the service under their own names. NANPA, which runs the North American numbering plan, lists NUSO as the holder of 739 prefixes in 50 states and territories, less than 1% of the 198,436 prefixes it has assigned.
- Name in NANPA's file
- NUSO, LLC
- What it is
- Cloud phone and wholesale number carrier
- Prefixes held
- 739 of 198,436 (less than 1%)
- States and territories
- 50 of 56, most in Texas, Illinois and California
- Area codes
- 254
- Pooled prefixes
- 100%, shared in blocks of 1,000 numbers
From NANPA's central office code file of October 1, 2026. A prefix is the three digits after the area code.
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Enter the full number to see its carrier now, which may not be NUSO if the number was ported. It is the same free check as our carrier lookup. To see whether it is a mobile, landline or VoIP line, use the line type lookup, and to see who it is listed to, the who called me lookup.
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A lookup shows NUSO when the number comes from a service that gets its numbers there.
NUSO rarely sells phone service to the person using the number. Internet calling apps, VoIP phone systems, call centers and business phone services get their numbers from carriers like NUSO, so a lookup shows the carrier behind the service, not the service itself.
Numbers can also move between carriers, so a lookup reads the number's carrier today, and a number with a NUSO prefix can show another company if it was ported.
NUSO holds the most prefixes in Texas: 60 of its 739.
- Texas60
- Illinois44
- California41
- Florida41
- New York38
- Ohio32
- Virginia30
- Pennsylvania28
Plus 425 prefixes in 42 more states and territories.
NUSO holds prefixes in 254 area codes, and these are its largest.
Of the prefixes NANPA dates, NUSO received the most in 2023: 189.
NANPA's file gives an assignment date for 639 of NUSO's 739 prefixes, all from 2001 on. The rest have no date in the file.
A call from a NUSO number is not spam just because of the carrier.
Numbers from wholesale carriers like NUSO are used by ordinary people on calling apps and by real businesses. They are also cheap and quick to get, so some robocallers use them too.
The carrier name alone does not make a call safe or spam: judge it by what the caller asks for, and be careful with anyone who asks for money, codes or passwords.
Check the full number with our free spam phone checker before you call back.
You can read about 5 more carrier names here.
- HD Carrier, LLCNumber holder with no public description, 329 prefixes
- Onvoy Spectrum, LLCSupplies numbers to VoIP and app-based phone services, 1,770 prefixes
- Onvoy, LLCSupplies numbers to VoIP and app-based phone services, 13,033 prefixes
- SkyetelWholesale phone carrier, 222 prefixes
- Peerless NetworkWholesale phone carrier, 1,265 prefixes
These are the questions people ask about NUSO.
What is NUSO, LLC?
NUSO is a cloud communications company: it runs its own phone network and sells business phone service, phone lines for office phone systems and phone numbers. It sells mostly through partners, such as phone resellers and IT providers, which offer the service under their own names.
Why does a phone lookup say NUSO?
A lookup shows NUSO when the number comes from a service that gets its numbers there. NUSO rarely sells phone service to the person using the number. Internet calling apps, VoIP phone systems, call centers and business phone services get their numbers from carriers like NUSO, so a lookup shows the carrier behind the service, not the service itself. Numbers can also move between carriers, so a lookup reads the number's carrier today, and a number with a NUSO prefix can show another company if it was ported.
Is a call from a NUSO number spam?
Numbers from wholesale carriers like NUSO are used by ordinary people on calling apps and by real businesses. They are also cheap and quick to get, so some robocallers use them too. The carrier name alone does not make a call safe or spam: judge it by what the caller asks for, and be careful with anyone who asks for money, codes or passwords. Check the full number with our free spam phone checker before you call back.
How many phone prefixes does NUSO hold?
NANPA lists NUSO as the holder of 739 prefixes, less than 1% of all assigned US prefixes. A prefix is the three digits after the area code and covers up to 10,000 numbers. 100% of these are pooled, so blocks of 1,000 numbers inside them can belong to other carriers.
Which states have the most NUSO prefixes?
Texas (60), Illinois (44) and California (41) have the most, out of 50 states and territories.
Can I find out who owns a NUSO number?
NUSO does not publish who uses its numbers. Our free who called me lookup shows who a US number is listed to and the city and state on the listing, when the number has a listing.
Source: NANPA, the North American Numbering Plan Administrator: its central office code assignments, as of October 1, 2026. Company histories are from public records and each company's own descriptions.