NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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 28
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 23
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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2017-01-24 431-730 not yet reported which blocks → TELUS Mobility 8303 Notre Dame de Lourdes —
2017-01-24 431-731 not yet reported which blocks → TELUS Mobility 8303 Elie —
2017-01-24 431-732 not yet reported which blocks → TELUS Mobility 8303 Hadashville —
2017-01-24 505-361 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J ALBUQURQUE NM
2017-01-24 631-310 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PATCHOGUE NY
2017-01-24 774-498 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 FRAMINGHAM MA
2017-01-24 914-918 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MOUNTKISCO NY
2017-01-24 949-410 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 IRVINE CA
2017-01-24 972-940 0–9 XXXall 10 · 3 holders which blocks → SOUTHWESTERN BELL 9533 DALLAS TX
2017-01-23 343-201 not yet reported which blocks → Videotron Ltd. 328F Alfred —
2017-01-23 424-538 0–9 XXXall 10 · 8 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 SNMN SNMN CA
2017-01-23 579-366 not yet reported which blocks → Videotron Ltd. 328F Lachute —
2017-01-23 607-443 1XXX which blocks → TELENGY L.L.C. - NY 473G BINGHAMTON NY
2017-01-23 646-983 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 NWYRCYZN01 NY
2017-01-23 774-764 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HOLDEN MA
2017-01-23 857-393 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2017-01-23 873-655 not yet reported which blocks → Videotron Ltd. 328F Gatineau —
2017-01-23 978-644 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - MA 892D GEORGETOWN MA
2017-01-20 224-477 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 DESPLAINES IL
2017-01-20 234-226 0–9 XXXall 10 · 6 holders which blocks → TELNYX LLC 073H AKRON OH
2017-01-20 423-269 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 CHATTNOOGA TN
2017-01-20 470-369 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - GA 8392 ATLANTA SO GA
2017-01-20 567-290 0–9 XXXall 10 · 6 holders which blocks → TELNYX LLC 073H TOLEDO OH
2017-01-20 614-809 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 COLUMBUS OH
2017-01-20 865-839 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 KNOXVILLE TN
2017-01-20 873-206 not yet reported which blocks → TELUS Quebec 2243 Grand'Mere —
2017-01-20 873-208 not yet reported which blocks → TELUS Quebec 2243 Shawinigan —
2017-01-20 873-209 not yet reported which blocks → TELUS Quebec 2243 St-Boniface-de-Shawinigan —
2017-01-20 873-210 not yet reported which blocks → TELUS Quebec 2243 St-Mathieu —
2017-01-20 873-654 not yet reported which blocks → Videotron Ltd. 328F St-Jovite —
2017-01-19 213-410 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 LSAN DA 01 CA
2017-01-19 479-367 0–9 XXXall 10 · 5 holders which blocks → SOUTHWESTERN BELL 9533 BENTONVL AR
2017-01-19 539-208 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J OWASSO OK
2017-01-19 562-378 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 WHITTIER CA
2017-01-19 581-667 not yet reported which blocks → Videotron Ltd. 328F Alma —
2017-01-19 581-668 not yet reported which blocks → Videotron Ltd. 328F Chicoutimi —
2017-01-19 581-669 not yet reported which blocks → Videotron Ltd. 328F Donnacona —
2017-01-19 581-670 not yet reported which blocks → Videotron Ltd. 328F La Malbaie —
2017-01-19 612-322 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MN 5816 TWINCITIES MN
2017-01-19 646-817 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2017-01-19 769-248 0XXX1XXX7XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MS 992E TAYLORSVL MS
2017-01-19 807-277 not yet reported which blocks → TBayTel 988H Fort Frances —
2017-01-19 859-310 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 LEXINGTON KY
2017-01-19 870-938 0–9 XXXall 10 · 5 holders which blocks → E. RITTER COMMUNICATIONS, LLC 128L JONESBORO AR
2017-01-19 910-928 0XXX1XXX2XXX3XXX8XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NC 998E TOPSAIL IS NC
2017-01-19 949-543 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E IRVINE CA
2017-01-18 319-271 0–9 XXXall 10 · 5 holders which blocks → UNITED STATES CELLULAR - IA 6266 INDEPNDNCE IA
2017-01-18 430-755 0XXX1XXX2XXX3XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F LONE OAK TX
2017-01-18 463-202 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 INDIANAPLS IN
2017-01-18 469-673 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F GRANDPRARI TX

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.