NumberResearch Membership · Data 09/28/2026

Recent prefix assignments

334 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/28/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, last 30 days
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 26
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 22
ONVOY, LLC - CA 19
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2016-07-12 516-329 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 NASSAUZN05 NY
2016-07-12 539-200 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 BARNSDALL OK
2016-07-12 539-203 0–9 XXXall 10 · 3 holders which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 STROUD OK
2016-07-12 606-781 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MEADS KY
2016-07-12 646-965 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 NWYRCYZN01 NY
2016-07-12 872-310 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2016-07-11 240-859 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - MD 876D ASHTON238 MD
2016-07-11 323-713 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F LSAN DA 09 CA
2016-07-11 417-615 9XXX which blocks → WINDSTREAM MISSOURI, INC. 1885 LIBERAL MO
2016-07-11 442-295 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BARSTOW CA
2016-07-11 469-975 0–9 XXXall 10 · 2 holders which blocks → COMMIO, LLC 022H PLANO TX
2016-07-11 470-421 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - GA 6540 ATLANTA GA
2016-07-11 551-249 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - NJ 637C PARK RIDGE NJ
2016-07-11 551-272 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - NJ 637C LEONIA NJ
2016-07-11 551-275 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 HACKENSACK NJ
2016-07-11 571-457 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN08 VA
2016-07-11 639-712 not yet reported which blocks → Distributel 081E Avonlea —
2016-07-11 639-713 not yet reported which blocks → Distributel 081E Balcarres —
2016-07-11 639-714 not yet reported which blocks → Distributel 081E Balgonie —
2016-07-11 639-715 not yet reported which blocks → Distributel 081E Bethune —
2016-07-11 639-716 not yet reported which blocks → Distributel 081E Broadview —
2016-07-11 639-717 not yet reported which blocks → Distributel 081E Craik —
2016-07-11 639-718 not yet reported which blocks → Distributel 081E Cupar —
2016-07-11 639-719 not yet reported which blocks → Distributel 081E Davidson —
2016-07-11 639-720 not yet reported which blocks → Distributel 081E Earl Grey —
2016-07-11 639-721 not yet reported which blocks → Distributel 081E Fort Qu'Appelle —
2016-07-11 639-722 not yet reported which blocks → Distributel 081E Francis —
2016-07-11 639-723 not yet reported which blocks → Distributel 081E Grenfell —
2016-07-11 639-724 not yet reported which blocks → Distributel 081E Holdfast —
2016-07-11 639-725 not yet reported which blocks → Distributel 081E Imperial —
2016-07-11 639-726 not yet reported which blocks → Distributel 081E Indian Head —
2016-07-11 639-727 not yet reported which blocks → Distributel 081E Kipling —
2016-07-11 639-728 not yet reported which blocks → Distributel 081E Lemberg —
2016-07-11 639-730 not yet reported which blocks → Distributel 081E Lumsden —
2016-07-11 639-731 not yet reported which blocks → Distributel 081E Maryfield —
2016-07-11 639-732 not yet reported which blocks → Distributel 081E Milestone —
2016-07-11 639-733 not yet reported which blocks → Distributel 081E Montmartre —
2016-07-11 639-734 not yet reported which blocks → Distributel 081E Moosomin —
2016-07-11 639-735 not yet reported which blocks → Distributel 081E Nokomis —
2016-07-11 639-736 not yet reported which blocks → Distributel 081E Odessa —
2016-07-11 639-737 not yet reported which blocks → Distributel 081E Pense —
2016-07-11 639-738 not yet reported which blocks → Distributel 081E Punnichy —
2016-07-11 639-750 not yet reported which blocks → Distributel 081E Qu'Appelle —
2016-07-11 639-751 not yet reported which blocks → Distributel 081E Raymore —
2016-07-11 639-752 not yet reported which blocks → Distributel 081E Regina Beach —
2016-07-11 639-753 not yet reported which blocks → Distributel 081E Riceton —
2016-07-11 639-754 not yet reported which blocks → Distributel 081E Rouleau —
2016-07-11 639-755 not yet reported which blocks → Distributel 081E Semans —
2016-07-11 639-756 not yet reported which blocks → Distributel 081E Southey —
2016-07-11 639-757 not yet reported which blocks → Distributel 081E Strasbourg —

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/28/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.