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
— 410-506 0XXX1XXX9XXX which blocks → VERIZON MARYLAND, INC. 9212 ELKTON MD
— 410-508 0XXX1XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 GLENBURNIE MD
— 410-512 6XXX7XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 TOWSON 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
— 410-531 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 COLUMBIA MD
— 410-532 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-534 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
— 410-541 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 SEVERNA PK MD
— 410-542 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-543 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 SALISBURY MD
— 410-544 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 SEVERNA PK MD
— 410-545 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-546 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 SALISBURY MD
— 410-547 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-548 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 SALISBURY MD
— 410-549 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 SYKESVILLE MD
— 410-550 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-551 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 SEVERN MD
— 410-552 7XXX8XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 SYKESVILLE MD
— 410-553 1XXX4XXX5XXX7XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 GLENBURNIE MD
— 410-554 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-556 0XXX2XXX5XXX7XXX8XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 CHURCHHILL MD
— 410-557 1XXX2XXX3XXX5XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 FORK MD
— 410-558 6XXX7XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-560 8XXX which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-561 6XXX which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-563 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-566 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-569 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 EDGEWOOD 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.