NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

355 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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. 38
ONVOY, LLC - CA 31
NEW CINGULAR WIRELESS PCS, LLC - IL 28
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 18
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
2010-05-26 262-422 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 WAUKESHA WI
2010-05-26 331-431 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E AURORA IL
2010-05-26 334-530 4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 6804 MONTGOMERY AL
2010-05-26 517-412 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E GRANDLEDGE MI
2010-05-26 720-420 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2010-05-26 732-540 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 RAHWAY NJ
2010-05-26 779-861 0XXX1XXX2XXX3XXX4XXX8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DIXON IL
2010-05-26 786-536 0–9 XXXall 10 · 4 holders which blocks → AT&T ENTERPRISES, LLC 516C MIAMI FL
2010-05-26 786-759 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 MIAMI FL
2010-05-26 928-280 7XXX8XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TUBA CITY AZ
2010-05-26 928-730 3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 FTDEFIANCE AZ
2010-05-26 971-343 0–9 XXXall 10 · 8 holders which blocks → BANDWIDTH.COM CLEC, LLC - OR 076F SILVERTON OR
2010-05-26 973-536 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - NJ 118F NEWARK NJ
2010-05-25 480-447 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2010-05-25 480-630 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2010-05-25 480-712 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2010-05-25 480-744 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2010-05-25 480-808 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2010-05-25 769-447 0–9 XXXall 10 · 4 holders which blocks → POWERTEL MEMPHIS LICENSES, INC. 7474 JACKSON MS
2010-05-25 864-438 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - SC 5258 GREENVILLE SC
2010-05-25 931-614 0–9 XXXall 10 · 8 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 CLARKSVL TN
2010-05-25 937-715 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F TROTWOOD OH
2010-05-24 260-365 0XXX1XXX5XXX7XXX8XXX · 4 holders which blocks → MCC TELEPHONY OF THE MID-WEST, LLC - IN 874F HOWE IN
2010-05-24 314-403 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MO 993E KIRKWOOD MO
2010-05-24 347-352 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E NWYRCYZN03 NY
2010-05-24 347-353 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 NWYRCYZN04 NY
2010-05-24 347-354 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E NWYRCYZN08 NY
2010-05-24 417-708 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 SPRINGFLD MO
2010-05-24 540-523 0–9 XXXall 10 · 3 holders which blocks → PAETEC ITEL, LLC 829J ROANOKE VA
2010-05-24 601-514 0–9 XXXall 10 · 7 holders which blocks → MCC TELEPHONY LLC 593K LUCEDALE MS
2010-05-24 702-605 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - NV 075F LAS VEGAS NV
2010-05-24 716-333 0–9 XXXall 10 · 5 holders which blocks → FINGER LAKES TECHNOLOGIES GROUP, INC. - NY 629E WILSON NY
2010-05-24 719-505 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 COLORDOSPG CO
2010-05-24 720-316 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - CO 078F DENVER CO
2010-05-24 720-523 0–9 XXXall 10 · 5 holders which blocks → QWEST CORPORATION 9636 DENVER CO
2010-05-21 248-266 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E ROCHESTER MI
2010-05-21 475-238 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2010-05-21 480-265 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2010-05-21 480-359 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2010-05-21 720-722 0–9 XXXall 10 · 2 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J DENVER CO
2010-05-21 832-504 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOUSTON TX
2010-05-21 832-508 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOUSTON TX
2010-05-21 832-516 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOUSTON TX
2010-05-21 973-558 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 NEWARK NJ
2010-05-20 251-299 0–9 XXXall 10 · 7 holders which blocks → MCC TELEPHONY OF THE SOUTH, LLC - AL 773F MT VERNON AL
2010-05-20 251-306 0–9 XXXall 10 · 5 holders which blocks → MCC TELEPHONY OF THE SOUTH, LLC - AL 773F IRNGTNSTEL AL
2010-05-20 647-773 not yet reported which blocks → Videotron Ltd. 383F Toronto —
2010-05-20 807-217 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 Dryden —
2010-05-20 807-231 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 Marathon —
2010-05-20 807-271 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 Fort Frances —

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.