NumberResearch Membership · Data 09/27/2026

Recent prefix assignments

334 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/27/2026

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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2020-09-21 562-525 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 DOWNEY CA
2020-09-21 579-829 not yet reported which blocks → Iristel Inc. 154E Valleyfield —
2020-09-21 602-742 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2020-09-21 607-477 0XXX2XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → FRACTEL, LLC 965H APALACHIN NY
2020-09-21 607-577 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H BATH NY
2020-09-21 607-599 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → FRACTEL, LLC 965H CATON NY
2020-09-21 636-245 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MAXVILLE MO
2020-09-21 641-274 2XXX4XXX5XXX7XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LOVILIA IA
2020-09-21 657-644 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H CYPRESS CA
2020-09-21 657-724 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H ANAHEIM CA
2020-09-21 657-733 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H HUNTITNBCH CA
2020-09-21 657-866 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H YORBALINDA CA
2020-09-21 657-933 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H ORANGE CA
2020-09-21 657-966 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H SANTA ANA CA
2020-09-21 661-744 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H PLDL PLDL CA
2020-09-21 661-866 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H BKFD MAIN CA
2020-09-21 667-293 1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → ONVOY, LLC - MD 876D SHARPTOWN MD
2020-09-21 667-294 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2020-09-21 667-676 0XXX1XXX2XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC - MD 876D WILLARDS MD
2020-09-21 707-852 0–9 XXXall 10 · 4 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SANTA ROSA CA
2020-09-21 720-743 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CO 078F LONGMONT CO
2020-09-21 743-220 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NC 6324 BURLINGTON NC
2020-09-21 747-842 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H VAN NUYS CA
2020-09-21 747-946 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H SNFN SPLV CA
2020-09-21 803-946 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BARNWELL SC
2020-09-21 814-556 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 478J WARREN PA
2020-09-21 870-618 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 EL DORADO AR
2020-09-21 873-498 not yet reported which blocks → Iristel Inc. 154E Sherbrooke —
2020-09-21 916-898 0–9 XXXall 10 · 2 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SCRM MAIN CA
2020-09-21 938-345 6XXX7XXX · 2 holders which blocks → FRACTEL, LLC 965H OWNSCRSRDS AL
2020-09-21 938-400 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H MASSEY AL
2020-09-21 947-228 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E FARMINGTON MI
2020-09-21 951-724 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H HEMT HMLD CA
2020-09-18 224-354 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D DESPLAINES IL
2020-09-18 224-566 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H ALGONQUIN IL
2020-09-18 226-793 not yet reported which blocks → Iristel Inc. 154E Woodstock —
2020-09-18 249-454 not yet reported which blocks → IXICA Communications Inc. 812H Brechin —
2020-09-18 249-589 not yet reported which blocks → IXICA Communications Inc. 812H Wasaga Beach —
2020-09-18 249-749 not yet reported which blocks → IXICA Communications Inc. 812H Orillia —
2020-09-18 249-759 not yet reported which blocks → IXICA Communications Inc. 812H Collingwood —
2020-09-18 249-849 not yet reported which blocks → IXICA Communications Inc. 812H Alliston —
2020-09-18 302-554 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - DE 6393 CAMDEN DE
2020-09-18 309-816 1XXX6XXX7XXX · 2 holders which blocks → IP HORIZON LLC 515J MONMOUTH IL
2020-09-18 331-267 0–9 XXXall 10 · 3 holders which blocks → VONAGE AMERICA LLC 197D LOMBARD IL
2020-09-18 431-830 not yet reported which blocks → Iristel Inc. 154E Anola —
2020-09-18 434-257 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 478J CHARLOTSVL VA
2020-09-18 463-242 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - IN 105F CUMBERLAND IN
2020-09-18 475-284 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 478J BRIDGEPORT CT
2020-09-18 516-966 0–9 XXXall 10 · 7 holders which blocks → FRACTEL, LLC 965H COLDSPGHBR NY
2020-09-18 561-556 0–9 XXXwhole prefix which blocks → ONVOY, LLC - FL 937C BOCA RATON FL

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/27/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.