NumberResearch Membership · Data 09/21/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/21/2026

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, all time — NPA 410
VERIZON MARYLAND, INC. 510
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
— 410-730 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 COLUMBIA MD
— 410-732 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-734 2XXX3XXX5XXX8XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 CHURCHVL MD
— 410-736 0XXX1XXX2XXX3XXX8XXX9XXX which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-737 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ARBUTUS MD
— 410-738 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WATERLO236 MD
— 410-740 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 COLUMBIA MD
— 410-741 2XXX3XXX4XXX7XXX8XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 WEST RIVER MD
— 410-742 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 SALISBURY MD
— 410-744 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 CATONSVL MD
— 410-745 1XXX7XXX8XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 STMICHAELS MD
— 410-747 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 CATONSVL MD
— 410-749 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 SALISBURY MD
— 410-750 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ELLICOTTCY MD
— 410-751 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WESTMINSTR MD
— 410-752 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-754 1XXX4XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 FEDERALSBG MD
— 410-755 0XXX1XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → VERIZON MARYLAND, INC. 9212 WARWICK MD
— 410-756 0XXX7XXX8XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 TANEYTOWN MD
— 410-757 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ANNAPOLIS MD
— 410-758 none assigned yet which blocks → VERIZON MARYLAND, INC. 9212 CENTREVL MD
— 410-760 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 GLENBURNIE MD
— 410-761 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 GLENBURNIE MD
— 410-762 0XXX2XXX3XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 GLENBURNIE MD
— 410-763 0XXX1XXX2XXX3XXX5XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 EASTON MD
— 410-764 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-765 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 GLENBURNIE MD
— 410-766 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 GLENBURNIE MD
— 410-767 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-768 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 GLENBURNIE MD
— 410-769 0XXX3XXX which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-770 0XXX1XXX2XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 EASTON MD
— 410-771 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 COCKEYSVL MD
— 410-772 4XXX which blocks → VERIZON MARYLAND, INC. 9212 COLUMBIA MD
— 410-773 0XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 COCKEYSVL MD
— 410-775 3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 UNION BDG MD
— 410-778 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 CHESTERTN MD
— 410-780 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ESSEX MD
— 410-781 1XXX2XXX3XXX5XXX8XXX9XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 ELLICOTTCY MD
— 410-782 0XXX1XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 ELKRIDGE MD
— 410-783 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-784 0XXX1XXX4XXX7XXX8XXX9XXX · 6 holders which blocks → VERIZON MARYLAND, INC. 9212 DEALISLAND MD
— 410-785 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 COCKEYSVL MD
— 410-787 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 GLENBURNIE MD
— 410-788 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 CATONSVL MD
— 410-789 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BRYNPKLNCM MD
— 410-791 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WATERLO236 MD
— 410-792 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WATERLO236 MD
— 410-793 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → VERIZON MARYLAND, INC. 9212 SEVERNA PK MD
— 410-795 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 SYKESVILLE MD

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.