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
— 251-602 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-604 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 MOBILE AL
— 251-605 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 MOBILE AL
— 251-607 1XXX2XXX6XXX8XXX · 3 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-609 4XXX8XXX which blocks → ELISKA WIRELESS VENTURES SUBSIDIARY I, LLC 6916 FOLEY AL
— 251-610 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 MOBILE AL
— 251-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AL
— 251-617 not yet reported which blocks → SPOK, INC. 6630 MOBILE AL
— 251-621 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-625 5XXX7XXX9XXX · 2 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-626 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-631 0XXX which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-633 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-634 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-635 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-638 not yet reported which blocks → TELEPAK NETWORKS, INC. - AL 947G MOBILE AL
— 251-639 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-643 0XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-645 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-647 0XXX1XXX2XXX8XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - AL 072F FLOMATON AL
— 251-648 none assigned yet which blocks → ELISKA WIRELESS VENTURES SUBSIDIARY I, LLC 6916 MOBILE AL
— 251-649 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-650 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AL 5255 MOBILE AL
— 251-652 3XXX5XXX8XXX · 2 holders which blocks → LEVEL 3 TELECOM OF ALABAMA, LLC - AL 7327 MOBILE AL
— 251-653 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-654 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-660 4XXX which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-661 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-662 9XXX which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-664 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - AL 604E MCINTOSH AL
— 251-665 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-666 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-675 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-679 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-680 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 MOBILE AL
— 251-689 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 MOBILE AL
— 251-690 none assigned yet which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-694 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-700 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AL
— 251-709 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 MOBILE AL
— 251-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AL
— 251-721 7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 6804 MOBILE AL
— 251-743 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL 0306 MONROEVL AL
— 251-744 0XXX1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AL 5255 JACKSON AL
— 251-746 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL 0306 PINE APPLE AL
— 251-751 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 MOBILE AL
— 251-752 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 FOLEY AL
— 251-753 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 6804 MOBILE AL
— 251-754 not yet reported which blocks → MILLRY TEL. CO. 0304 FRANKVILLE AL
— 251-765 0XXX1XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF THE SOUTH, LLC - AL 0306 EXCEL AL

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.