NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

2 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 — NPA 810
NEW CINGULAR WIRELESS PCS, LLC - IL 2
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
— 810-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 810-213 2XXX3XXX5XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 FLINT MI
— 810-217 8XXX which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 SOUTHFIELD MI
— 810-220 9XXX which blocks → MICHIGAN BELL TEL CO 9323 BRIGHTON MI
— 810-222 3XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 BRIGHTON MI
— 810-223 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 FLINT MI
— 810-224 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 BRIGHTON MI
— 810-225 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 BRIGHTON MI
— 810-227 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 BRIGHTON MI
— 810-229 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 BRIGHTON MI
— 810-230 4XXX which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-231 5XXX which blocks → MICHIGAN BELL TEL CO 9323 BRIGHTON MI
— 810-232 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-233 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-234 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-235 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-236 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-237 0XXX1XXX9XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-238 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-239 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-240 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 FLINT MI
— 810-241 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 FLINT MI
— 810-244 not yet reported which blocks → PAETEC ITEL, LLC 829J FLINT MI
— 810-245 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LAPEER MI
— 810-249 not yet reported which blocks → PAETEC ITEL, LLC 829J FLINT MI
— 810-250 1XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-251 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-252 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 FLINT MI
— 810-253 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 IMLAY CITY MI
— 810-257 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-265 7XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FLINT MI
— 810-266 0XXX1XXX2XXX3XXX7XXX8XXX · 4 holders which blocks → MICHIGAN BELL TEL CO 9323 BYRON MI
— 810-267 0–9 XXXall 10 · 5 holders which blocks → 123.NET, LLC 2550 LAPEER MI
— 810-269 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E SANDUSKY MI
— 810-272 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 8 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 LAPEER MI
— 810-275 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 FLINT MI
— 810-277 3XXX9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 LAPEER MI
— 810-278 9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ALGONAC MI
— 810-280 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 FLINT MI
— 810-287 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 FLINT MI
— 810-290 not yet reported which blocks → SPOK, INC. 6630 FLINT MI
— 810-291 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J BRIGHTON MI
— 810-299 0XXX1XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BRIGHTON MI
— 810-301 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-304 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 YALE MI
— 810-305 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MEMPHIS MI
— 810-310 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 CAPAC MI
— 810-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 810-312 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 BRIGHTON MI
— 810-315 0XXX6XXX9XXX · 3 holders which blocks → 123.NET, LLC 2550 DRYDEN MI

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.