NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 301
VERIZON MARYLAND, INC. 465
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
— 301-443 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN11 MD
— 301-444 4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
— 301-445 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN3 MD
— 301-446 5XXX which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z13 MD
— 301-447 0XXX4XXX8XXX9XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 EMMITSBURG MD
— 301-449 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN5 MD
— 301-451 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
— 301-453 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 KITZMILLER MD
— 301-454 9XXX which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
— 301-457 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN3 MD
— 301-459 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
— 301-460 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN11 MD
— 301-463 0XXX1XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 LONACONING MD
— 301-464 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z14 MD
— 301-468 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN11 MD
— 301-469 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
— 301-470 0XXX which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z14 MD
— 301-472 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 MECHANCSVL MD
— 301-473 0XXX1XXX2XXX3XXX6XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 FREDERICK MD
— 301-474 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z13 MD
— 301-475 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 LEONARDTN MD
— 301-476 0XXX1XXX3XXX4XXX5XXX6XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 ASHTON236 MD
— 301-478 0XXX1XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 FLINTSTONE MD
— 301-480 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
— 301-482 4XXX5XXX7XXX8XXX9XXX which blocks → VERIZON MARYLAND, INC. 9212 DAMASCS236 MD
— 301-483 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 LAUREL236 MD
— 301-486 5XXX8XXX9XXX which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z13 MD
— 301-487 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 MYERSVILLE MD
— 301-488 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z13 MD
— 301-489 2XXX which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z13 MD
— 301-490 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 LAUREL236 MD
— 301-492 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
— 301-493 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
— 301-494 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNG238Z15 MD
— 301-495 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN3 MD
— 301-496 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
— 301-497 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 LAUREL236 MD
— 301-498 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 LAUREL236 MD
— 301-499 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN5 MD
— 301-504 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN3 MD
— 301-505 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN6 MD
— 301-507 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z13 MD
— 301-513 2XXX4XXX8XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z13 MD
— 301-515 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 GAITHERSBG MD
— 301-516 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN5 MD
— 301-517 6XXX7XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
— 301-519 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 GAITHERSBG MD
— 301-521 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN6 MD
— 301-522 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN11 MD
— 301-527 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 GAITHERSBG MD

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.