NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

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

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
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
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
— 410-436 0XXX9XXX which blocks → VERIZON MARYLAND, INC. 9212 EDGEWOOD MD
— 410-437 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ARGRGBSNIS MD
— 410-438 0XXX1XXX4XXX6XXX7XXX8XXX · 6 holders which blocks → VERIZON MARYLAND, INC. 9212 SUDLERSVL MD
— 410-439 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ARGRGBSNIS MD
— 410-440 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
— 410-441 2XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ELKTON MD
— 410-442 6XXX which blocks → VERIZON MARYLAND, INC. 9212 ELLICOTTCY MD
— 410-444 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-445 not yet reported which blocks → SPOK, INC. 6630 BALTIMORE MD
— 410-446 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
— 410-447 not yet reported which blocks → SPOK, INC. 6630 COLUMBIA MD
— 410-448 8XXX which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-450 3XXX4XXX which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-451 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 CROFTON MD
— 410-452 1XXX2XXX3XXX4XXX6XXX7XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 CARDIFF MD
— 410-453 1XXX2XXX3XXX7XXX8XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-454 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 BALTIMORE MD
— 410-455 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 CATONSVL MD
— 410-456 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
— 410-457 1XXX3XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → VERIZON MARYLAND, INC. 9212 DARLINGTON MD
— 410-458 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
— 410-459 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FALLSTON MD
— 410-460 not yet reported which blocks → SPOK, INC. 6630 ELKRIDGE MD
— 410-461 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ELLICOTTCY MD
— 410-462 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-463 none assigned yet which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TRAPPE MD
— 410-464 7XXX8XXX which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-465 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ELLICOTTCY MD
— 410-466 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-467 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-468 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-469 0XXX1XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-471 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ELKRIDGE MD
— 410-472 5XXX8XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 SPARKSGLNC MD
— 410-473 not yet reported which blocks → SPOK, INC. 6630 TOWSON MD
— 410-474 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 PRINCEFRCK MD
— 410-475 not yet reported which blocks → SPOK, INC. 6630 TOWSON MD
— 410-476 0XXX1XXX2XXX6XXX7XXX8XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 TRAPPE MD
— 410-477 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 SPARROWSPT MD
— 410-479 6XXX7XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 DENTON MD
— 410-480 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ELLICOTTCY MD
— 410-481 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-482 0XXX1XXX3XXX4XXX5XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 GREENSBORO MD
— 410-483 8XXX which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-484 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 PIKESVILLE MD
— 410-485 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-486 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 PIKESVILLE MD
— 410-487 1XXX2XXX3XXX4XXX5XXX6XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 GLENBURNIE MD
— 410-488 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-489 1XXX3XXX8XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 GLENWOOD MD

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.