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
2020-10-05 346-440 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J HSTNSUBURB TX
2020-10-05 346-441 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J HOUSTON TX
2020-10-05 385-361 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J MIDVALE UT
2020-10-05 385-993 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J LEHI UT
2020-10-05 470-668 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - GA 983E ATLANTA GA
2020-10-05 470-726 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J ATLANTA SO GA
2020-10-05 501-445 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOTSPRINGS AR
2020-10-05 505-441 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 478J ALBUQURQUE NM
2020-10-05 509-606 0–9 XXXall 10 · 2 holders which blocks → HD CARRIER LLC 321J SPOKANE WA
2020-10-05 661-509 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E BKFD SOUTH CA
2020-10-05 720-912 0–9 XXXwhole prefix which blocks → ONVOY, LLC - CO 026D DENVER CO
2020-10-05 747-297 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E GLENDALE CA
2020-10-05 757-993 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 TEMPERNCVL VA
2020-10-05 765-556 0XXX4XXX5XXX6XXX9XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H CUTLER IN
2020-10-05 857-367 0–9 XXXall 10 · 3 holders which blocks → TC SYSTEMS, INC. 7135 WATERTOWN MA
2020-10-05 986-566 1XXX2XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → FRACTEL, LLC 965H CRAIGMONT ID
2020-10-05 986-677 6XXX7XXX · 2 holders which blocks → FRACTEL, LLC 965H FREEDOM ID
2020-10-02 281-868 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 BAYTOWN TX
2020-10-02 405-981 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BETHANY OK
2020-10-02 414-261 0–9 XXXall 10 · 3 holders which blocks → HD CARRIER LLC 321J MILWAUKZN1 WI
2020-10-02 470-654 0–9 XXXall 10 · 2 holders which blocks → VONAGE AMERICA LLC 197D ATLANTA GA
2020-10-02 470-665 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D CONYERS GA
2020-10-02 470-748 0–9 XXXall 10 · 3 holders which blocks → VONAGE AMERICA LLC 197D ATLANTA NW GA
2020-10-02 479-433 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - AR 348F WALDRON AR
2020-10-02 479-447 0XXX4XXX5XXX7XXX · 3 holders which blocks → ONVOY, LLC - AR 348F MANSFIELD AR
2020-10-02 479-467 0XXX1XXX6XXX7XXX · 3 holders which blocks → ONVOY, LLC - AR 348F CHARLESTON AR
2020-10-02 480-801 0–9 XXXall 10 · 3 holders which blocks → TWILIO INTERNATIONAL, INC. 506J PHOENIX AZ
2020-10-02 501-521 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - AR 348F HOTSPRINGS AR
2020-10-02 520-530 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - AZ 630E TUCSON AZ
2020-10-02 540-824 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 478J BLACKSBURG VA
2020-10-02 608-722 0–9 XXXall 10 · 4 holders which blocks → HD CARRIER LLC 321J MADISON WI
2020-10-02 612-451 0–9 XXXall 10 · 2 holders which blocks → VONAGE AMERICA LLC 197D TWINCITIES MN
2020-10-02 612-452 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J TWINCITIES MN
2020-10-02 620-599 0XXX1XXX5XXX6XXX9XXX · 4 holders which blocks → ONVOY, LLC - KS 205F PRESTON KS
2020-10-02 620-610 0XXX1XXX2XXX · 2 holders which blocks → ONVOY, LLC - KS 205F FALL RIVER KS
2020-10-02 620-630 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - KS 205F RIVERTON KS
2020-10-02 620-667 0–9 XXXall 10 · 9 holders which blocks → ONVOY, LLC - KS 205F COTONWDFLS KS
2020-10-02 681-349 0–9 XXXall 10 · 5 holders which blocks → HD CARRIER LLC 321J MORGANTOWN WV
2020-10-02 725-239 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D LAS VEGAS NV
2020-10-02 740-790 0XXX1XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - OH 464C MCARTHUR OH
2020-10-02 763-338 0–9 XXXwhole prefix which blocks → COMCAST IP PHONE, LLC 318J TWINCITIES MN
2020-10-02 785-705 7XXX8XXX which blocks → ONVOY, LLC - KS 205F MICHIGNVLY KS
2020-10-02 785-755 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC - KS 205F MINNEAPOLS KS
2020-10-02 785-780 0XXX1XXX2XXX3XXX7XXX8XXX · 5 holders which blocks → ONVOY, LLC - KS 205F SOLOMON KS
2020-10-02 785-795 0XXX2XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC - KS 205F HERNDON KS
2020-10-02 785-881 0XXX1XXX2XXX3XXX9XXX · 4 holders which blocks → ONVOY, LLC - KS 205F OBERLIN KS
2020-10-02 785-886 1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - KS 205F SENECA KS
2020-10-02 785-975 0XXX5XXX7XXX8XXX · 2 holders which blocks → ONVOY, LLC - KS 205F SOUTHHARDY KS
2020-10-02 785-977 7XXX8XXX which blocks → ONVOY, LLC - KS 205F POMONA KS
2020-10-02 831-215 0–9 XXXall 10 · 4 holders which blocks → HD CARRIER LLC 321J MONTEREY CA

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.