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
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 53
NEW CINGULAR WIRELESS PCS, LLC - DC 51
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 45
SPOK, INC. 28
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
— 410-206 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
— 410-207 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
— 410-208 5XXX7XXX8XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 BERLIN MD
— 410-209 0XXX7XXX9XXX which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MD
— 410-212 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ANNAPOLIS MD
— 410-213 3XXX4XXX5XXX6XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 OCEAN CITY MD
— 410-215 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
— 410-216 0XXX1XXX2XXX3XXX4XXX5XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 ANNAPOLIS MD
— 410-217 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-218 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
— 410-219 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 SALISBURY MD
— 410-221 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 CAMBRIDGE MD
— 410-222 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 SEVERN MD
— 410-223 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-224 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ANNAPOLIS MD
— 410-225 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-226 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → VERIZON MARYLAND, INC. 9212 OXFORD MD
— 410-227 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
— 410-228 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 CAMBRIDGE MD
— 410-229 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 COCKEYSVL MD
— 410-230 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-231 2XXX3XXX5XXX7XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 SOLOMONS MD
— 410-232 not yet reported which blocks → SPOK, INC. 6630 BALTIMORE MD
— 410-233 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-234 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-235 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-236 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
— 410-237 0XXX1XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-238 9XXX which blocks → VERIZON MARYLAND, INC. 9212 ESSEX MD
— 410-239 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 REISTERSTN MD
— 410-241 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
— 410-242 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ARBUTUS MD
— 410-243 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-244 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-245 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
— 410-246 4XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 BALTIMORE MD
— 410-247 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ARBUTUS MD
— 410-248 5XXX7XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 PARKVILLE MD
— 410-249 none assigned yet which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-250 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 OCEAN CITY MD
— 410-251 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY MD
— 410-252 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-253 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 EASTON MD
— 410-254 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-255 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ARGRGBSNIS MD
— 410-256 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 PARKVILLE MD
— 410-257 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 NORTHBEACH MD
— 410-258 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
— 410-259 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WESTMINSTR 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.