NumberResearch Membership · Data 09/22/2026

Recent prefix assignments

354 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/22/2026

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. 39
NEW CINGULAR WIRELESS PCS, LLC - IL 28
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 20
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
2011-06-03 438-317 not yet reported which blocks → Distributel 083E Montreal —
2011-06-03 438-318 not yet reported which blocks → Distributel 083E Montreal —
2011-06-03 438-319 not yet reported which blocks → Distributel 083E Montreal —
2011-06-03 502-908 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → WINDSTREAM KENTUCKY WEST, INC. 0402 ZONETON KY
2011-06-03 606-492 0–9 XXXall 10 · 5 holders which blocks → WINDSTREAM KENTUCKY EAST, INC. - LEXINGTON 9690 SOMERSET KY
2011-06-03 631-527 0–9 XXXall 10 · 5 holders which blocks → CSC VOICE, LLC 612K E HAMPTON NY
2011-06-03 647-732 not yet reported which blocks → Distributel 082E Toronto —
2011-06-03 647-733 not yet reported which blocks → Distributel 082E Toronto —
2011-06-03 647-734 not yet reported which blocks → Distributel 082E Toronto —
2011-06-03 647-735 not yet reported which blocks → Distributel 082E Toronto —
2011-06-03 647-736 not yet reported which blocks → Distributel 082E Toronto —
2011-06-03 734-589 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E WAYNE MI
2011-06-03 850-296 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - FL 982E TALLAHASSE FL
2011-06-03 915-230 0–9 XXXall 10 · 3 holders which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
2011-06-03 915-236 0–9 XXXall 10 · 3 holders which blocks → SOUTHWESTERN BELL 9533 EL PASO TX
2011-06-02 479-237 0XXX1XXX2XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 RUSSELLVL AR
2011-06-02 480-395 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2011-06-02 501-243 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-06-02 513-370 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
2011-06-02 612-222 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TWINCITIES MN
2011-06-02 615-854 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 NASHVILLE TN
2011-06-02 684-248 not yet reported which blocks → AST TELECOM, LLC 1460 AM SAMOA AS
2011-06-02 702-690 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LAS VEGAS NV
2011-06-02 760-991 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J VTVL ADLN CA
2011-06-02 774-294 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E FALL RIVER MA
2011-06-02 774-462 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E MILFORD MA
2011-06-02 865-221 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 KNOXVILLE TN
2011-06-02 870-280 0–9 XXXall 10 · 7 holders which blocks → WINDSTREAM ARKANSAS, INC. 1691 HARRISON AR
2011-06-01 202-594 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN1 DC
2011-06-01 210-631 0–9 XXXwhole prefix which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 8434 SANANTONIO TX
2011-06-01 438-395 not yet reported which blocks → Videotron Ltd. 328F Montreal —
2011-06-01 438-396 not yet reported which blocks → Videotron Ltd. 328F Montreal —
2011-06-01 443-475 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 BALTIMORE MD
2011-06-01 581-560 not yet reported which blocks → Videotron Ltd. 328F Chicoutimi —
2011-06-01 585-358 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 HENRIETTA NY
2011-06-01 647-303 not yet reported which blocks → Videotron Ltd. 383F Toronto —
2011-06-01 647-745 not yet reported which blocks → Videotron Ltd. 383F Toronto —
2011-06-01 647-767 not yet reported which blocks → Videotron Ltd. 383F Toronto —
2011-06-01 702-675 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 LAS VEGAS NV
2011-06-01 707-883 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E UPPER LAKE CA
2011-06-01 754-263 0–9 XXXall 10 · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C HOLLYWOOD FL
2011-06-01 850-331 0–9 XXXall 10 · 4 holders which blocks → PAETEC ITEL, LLC 829J CRESTVIEW FL
2011-05-31 412-354 0–9 XXXall 10 · 3 holders which blocks → VERIZON PENNSYLVANIA, INC. 9208 PTTSBGZON1 PA
2011-05-31 434-885 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J EMPORIA VA
2011-05-31 574-222 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J SOUTH BEND IN
2011-05-31 812-668 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J BLOOMINGTN IN
2011-05-31 832-471 0–9 XXXall 10 · 4 holders which blocks → SOUTHWESTERN BELL 9533 RICHMNRNBG TX
2011-05-31 919-948 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NC 3235 RALEIGH NC
2011-05-30 226-428 not yet reported which blocks → Bragg Communications Inc. 4878 Neustadt —
2011-05-30 226-437 not yet reported which blocks → Bragg Communications Inc. 4878 Ayton —

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/22/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.