Verified Nov 1, 2026 · Source: NANPA CO Code Assignment

Which carrier owns 412 numbers?

40 holders appear in the 762 number blocks assigned in 412 of the 786 possible. Verizon holds the largest named share at 51.0%, ahead of AT&T at 12.5%. A further 6.8% sits with holders outside the national carriers, counted together: competitive local exchange carriers, VoIP providers and the resellers behind app-based numbers. These are blocks allocated by NANPA, not customers. Number portability means a block registered to one carrier can be full of numbers now served by another, so the share describes the registry, not the market. The top 16 holders shown account for 99.9% of assigned blocks. Blocks are allocated to rate centers; the largest in 412 are PTTSBGZON1 (314), PTGSBNZN14 (41) and PTTSBGZON6 (34).

Share of assigned number blocks

Verizon 51%

AT&T 12.5%

T-Mobile 7.3%

Other CLEC / VoIP 6.8%

Onvoy 5.5%

Windstream 5%

Lumen 4.5%

Spok 3.1%

Bandwidth 1.7%

Comcast 0.9%

Charter 0.7%

Peerless 0.3%

Telnyx 0.3%

8x8 0.1%

Vonage 0.1%

TPx 0.1%

Of the 762 blocks assigned in 412 out of 786 possible; the 16 holders shown cover 99.9% of them. Each block is 10,000 consecutive numbers. Bars are scaled to the largest holder, not to 100%.

Why this is not “who your caller uses”

Number portability means a subscriber keeps their number when they change carrier, while the block stays registered to whoever originally received it. In a code that has been in service for decades, a large share of numbers are served by a carrier other than the registered holder. The table above is an accurate picture of the numbering registry and a poor proxy for market share.

Where the blocks sit

Blocks are allocated to rate centers – the billing geography, not the carrier. NANPA truncates their names to ten characters, and in large metros they are telephone zones rather than places, so we leave them unchanged rather than guessing. Showing the largest 5 of 32.

PTTSBGZON1314

PTGSBNZN1441

PTTSBGZON634

PTGSBNZN2232