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
— 410-490 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 CENTREVL MD
— 410-491 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
— 410-492 not yet reported which blocks → SPOK, INC. 6630 TOWSON MD
— 410-493 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
— 410-494 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-495 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 PRINCEFRCK MD
— 410-496 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 RANDALLSTN MD
— 410-497 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J PARKVILLE MD
— 410-498 4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J COCKEYSVL MD
— 410-499 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
— 410-500 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
— 410-502 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-503 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ELKRIDGE MD
— 410-504 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 PIKESVILLE MD
— 410-505 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → VERIZON MARYLAND, INC. 9212 ELLICOTTCY MD
— 410-506 0XXX1XXX9XXX which blocks → VERIZON MARYLAND, INC. 9212 ELKTON MD
— 410-507 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ANNAPOLIS MD
— 410-508 0XXX1XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 GLENBURNIE MD
— 410-509 not yet reported which blocks → BALTIMORE-WASHINGTON TELEPHONE (BWT) 8697 WATERLO236 MD
— 410-510 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 FORK MD
— 410-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MD
— 410-512 6XXX7XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-513 4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 PARKVILLE MD
— 410-514 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 SEVERN MD
— 410-515 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 FORK MD
— 410-516 9XXX which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-517 4XXX6XXX7XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 REISTERSTN MD
— 410-518 2XXX3XXX4XXX5XXX which blocks → VERIZON MARYLAND, INC. 9212 SEVERNA PK MD
— 410-519 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 SEVERN MD
— 410-520 1XXX3XXX4XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 OCEAN CITY MD
— 410-521 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 RANDALLSTN MD
— 410-522 8XXX which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-523 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-524 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 OCEAN CITY MD
— 410-525 4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-526 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 REISTERSTN MD
— 410-527 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 COCKEYSVL MD
— 410-528 3XXX which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-529 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 PARKVILLE MD
— 410-530 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
— 410-531 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 COLUMBIA MD
— 410-532 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-533 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
— 410-534 9XXX which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-535 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 PRINCEFRCK MD
— 410-536 2XXX3XXX6XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 ARBUTUS MD
— 410-537 0XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-538 0XXX1XXX2XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 FORK MD
— 410-539 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-540 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ELKRIDGE 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.