NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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
— 410-272 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ABERDEEN MD
— 410-273 3XXX which blocks → VERIZON MARYLAND, INC. 9212 ABERDEEN MD
— 410-275 0XXX3XXX4XXX5XXX6XXX7XXX · 6 holders which blocks → VERIZON MARYLAND, INC. 9212 CECILTON MD
— 410-276 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-277 1XXX which blocks → VERIZON MARYLAND, INC. 9212 WOODLAWN MD
— 410-278 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ABERDEEN MD
— 410-280 7XXX which blocks → VERIZON MARYLAND, INC. 9212 ANNAPOLIS MD
— 410-281 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WOODLAWN MD
— 410-282 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 DUNDALK MD
— 410-284 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 DUNDALK MD
— 410-285 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 DUNDALK MD
— 410-286 1XXX4XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 NORTHBEACH MD
— 410-287 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 NORTH EAST MD
— 410-288 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 DUNDALK MD
— 410-289 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 OCEAN CITY MD
— 410-290 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 COLUMBIA MD
— 410-291 1XXX2XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-295 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ANNAPOLIS MD
— 410-296 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-297 0XXX1XXX7XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 ABERDEEN MD
— 410-298 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WOODLAWN MD
— 410-305 4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 ODENTON MD
— 410-306 5XXX6XXX7XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 ABERDEEN MD
— 410-307 0XXX1XXX3XXX4XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-308 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-309 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 COLUMBIA MD
— 410-312 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 COLUMBIA MD
— 410-313 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ELLICOTTCY MD
— 410-315 0XXX1XXX2XXX3XXX4XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 SEVERNA PK MD
— 410-316 1XXX6XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 COCKEYSVL MD
— 410-318 9XXX which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-319 0XXX2XXX4XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-321 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-323 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-324 0XXX2XXX3XXX6XXX7XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-325 0XXX which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-326 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 SOLOMONS MD
— 410-327 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-328 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-329 0XXX4XXX8XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 COCKEYSVL MD
— 410-332 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-333 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-334 0XXX1XXX4XXX8XXX9XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 SALISBURY MD
— 410-335 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 CHASE MD
— 410-337 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-338 9XXX which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-339 0XXX1XXX2XXX8XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-341 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 SALISBURY MD
— 410-342 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-343 4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 SPARKSGLNC MD

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.