Level 3 Communications is part of Lumen and runs business and wholesale phone lines.
Level 3 Communications built one of the largest long-distance and internet networks in the US. CenturyLink bought it in 2017 and renamed itself Lumen Technologies in 2020, so Level 3 numbers belong to Lumen today. It sells phone lines to businesses and supplies numbers and calling to other phone companies and internet calling services. NANPA, which runs the North American numbering plan, lists Level 3 as the holder of 10,346 prefixes in 51 states and territories, 5.2% of the 198,436 prefixes it has assigned.
- Name in NANPA's file
- LEVEL 3 COMMUNICATIONS, LLC - CA, and 83 other listings
- What it is
- Lumen's business and wholesale network
- Prefixes held
- 10,346 of 198,436 (5.2%)
- States and territories
- 51 of 56, most in California, Texas and Pennsylvania
- Area codes
- 327
- Pooled prefixes
- 97%, 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.
You can check which carrier a number is on today, for free.
Enter the full number to see its carrier now, which may not be Level 3 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.
Pick the country, then enter the number without the country code.
Free & rate-limited. No signup required to try.
A lookup shows Level 3 when the number is a business line or comes from a service that gets its numbers from Lumen.
Level 3 sells phone lines to companies, so many of its numbers are office lines, call centers and other business phone systems.
Others reach people through the internet calling services that get their numbers from Level 3.
Numbers can also move between carriers, so a lookup reads the number's carrier today, and a number with a Level 3 prefix can show another company if it was ported.
Level 3 holds the most prefixes in California: 1,227 of its 10,346.
- California1,227
- Texas899
- Pennsylvania570
- Illinois524
- New York515
- Ohio505
- Florida464
- New Jersey395
Plus 5,247 prefixes in 43 more states and territories.
Level 3 holds prefixes in 327 area codes, and these are its largest.
Of the prefixes NANPA dates, Level 3 received the most in 2002: 1,484.
NANPA's file gives an assignment date for 5,070 of Level 3's 10,346 prefixes, all from 2001 on. The rest have no date in the file.
A call from a Level 3 number is not spam just because of the carrier.
Level 3 sells phone lines to businesses, so a call from one of its numbers often comes from a company's office or call center.
Whether that call is one you want is a separate question, and caller ID can be faked, so judge it by what the caller asks for.
Check the full number with our free spam phone checker before you call back.
You can read about 5 more carrier names here.
- Teleport Communications America, LLCAT&T's business phone network, 4,083 prefixes
- PAETEC iTel, LLCWindstream's business phone network, 5,552 prefixes
- TPx CommunicationsBusiness phone and internet company, 807 prefixes
- LightpathBusiness fiber and phone network, 269 prefixes
- AllstreamBusiness phone and internet company, 450 prefixes
These are the questions people ask about Level 3.
What is Level 3 Communications, LLC?
Level 3 Communications built one of the largest long-distance and internet networks in the US. CenturyLink bought it in 2017 and renamed itself Lumen Technologies in 2020, so Level 3 numbers belong to Lumen today. It sells phone lines to businesses and supplies numbers and calling to other phone companies and internet calling services.
Why does a phone lookup say Level 3?
A lookup shows Level 3 when the number is a business line or comes from a service that gets its numbers from Lumen. Level 3 sells phone lines to companies, so many of its numbers are office lines, call centers and other business phone systems. Others reach people through the internet calling services that get their numbers from Level 3. Numbers can also move between carriers, so a lookup reads the number's carrier today, and a number with a Level 3 prefix can show another company if it was ported.
Is a call from a Level 3 number spam?
Level 3 sells phone lines to businesses, so a call from one of its numbers often comes from a company's office or call center. Whether that call is one you want is a separate question, and caller ID can be faked, so judge it by what the caller asks for. Check the full number with our free spam phone checker before you call back.
How many phone prefixes does Level 3 hold?
NANPA lists Level 3 as the holder of 10,346 prefixes, 5.2% of all assigned US prefixes. A prefix is the three digits after the area code and covers up to 10,000 numbers. 97% of these are pooled, so blocks of 1,000 numbers inside them can belong to other carriers.
Which states have the most Level 3 prefixes?
California (1,227), Texas (899) and Pennsylvania (570) have the most, out of 51 states and territories.
Can I find out who owns a Level 3 number?
Level 3 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.