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
— 410-643 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 STEVENSVL MD
— 410-644 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-646 8XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-647 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 SEVERNA PK MD
— 410-648 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 7 holders which blocks → VERIZON MARYLAND, INC. 9212 GALENA MD
— 410-651 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 PRINCEANNE MD
— 410-653 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 PIKESVILLE MD
— 410-654 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 PIKESVILLE MD
— 410-655 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 RANDALLSTN MD
— 410-659 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-661 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 PARKVILLE MD
— 410-662 2XXX3XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-663 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 PARKVILLE MD
— 410-664 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-665 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 PARKVILLE MD
— 410-666 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 COCKEYSVL MD
— 410-667 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 COCKEYSVL MD
— 410-668 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 PARKVILLE MD
— 410-669 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-671 0XXX1XXX2XXX3XXX4XXX5XXX8XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 EDGEWOOD MD
— 410-672 9XXX which blocks → VERIZON MARYLAND, INC. 9212 ODENTON MD
— 410-673 0XXX3XXX4XXX6XXX8XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 PRESTON MD
— 410-674 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ODENTON MD
— 410-675 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-676 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 EDGEWOOD MD
— 410-677 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 SALISBURY MD
— 410-679 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 FORK MD
— 410-682 7XXX which blocks → VERIZON MARYLAND, INC. 9212 ESSEX MD
— 410-683 5XXX8XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 COCKEYSVL MD
— 410-684 4XXX5XXX8XXX9XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 GLENBURNIE MD
— 410-685 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-686 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ESSEX MD
— 410-687 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ESSEX MD
— 410-691 3XXX8XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 GLENBURNIE MD
— 410-692 1XXX3XXX4XXX8XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 JARRETTSVL MD
— 410-694 1XXX7XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 GLENBURNIE MD
— 410-695 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 ODENTON MD
— 410-706 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-712 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ELKRIDGE MD
— 410-715 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 COLUMBIA MD
— 410-716 4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-719 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 CATONSVL MD
— 410-720 2XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 ELLICOTTCY MD
— 410-721 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 CROFTON MD
— 410-722 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WATERLO236 MD
— 410-723 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 OCEAN CITY MD
— 410-724 1XXX8XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 WATERLO236 MD
— 410-727 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-728 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-729 6XXX which blocks → VERIZON MARYLAND, INC. 9212 SEVERN 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.