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
— 410-890 not yet reported which blocks → SPOK, INC. 6630 TOWSON MD
— 410-891 4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 COCKEYSVL MD
— 410-892 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 GLENBURNIE MD
— 410-893 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 FORK MD
— 410-894 not yet reported which blocks → SPOK, INC. 6630 TOWSON MD
— 410-895 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-896 0XXX1XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 DELMAR MD
— 410-897 2XXX7XXX which blocks → VERIZON MARYLAND, INC. 9212 ANNAPOLIS MD
— 410-898 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WATERLO236 MD
— 410-899 not yet reported which blocks → SPOK, INC. 6630 TOWSON MD
— 410-901 3XXX7XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 CAMBRIDGE MD
— 410-902 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 PIKESVILLE MD
— 410-903 none assigned yet which blocks → METROPCS, INC. 5562 SEVERNA PK MD
— 410-904 0XXX1XXX2XXX3XXX5XXX6XXX8XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 WATERLO238 MD
— 410-905 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
— 410-906 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-907 1XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 WOODLAWN MD
— 410-908 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
— 410-909 not yet reported which blocks → SPOK, INC. 6630 ELKRIDGE MD
— 410-910 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 COLUMBIA MD
— 410-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MD
— 410-912 not yet reported which blocks → PAETEC ITEL, LLC 829J SALISBURY MD
— 410-913 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
— 410-914 1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J CHURCHVL MD
— 410-916 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
— 410-917 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
— 410-918 7XXX8XXX which blocks → VERIZON MARYLAND, INC. 9212 ESSEX MD
— 410-919 3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 ANNAPOLIS MD
— 410-920 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ELKTON MD
— 410-921 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 TELECOM OF MARYLAND, LLC - MD 7591 SEVERN MD
— 410-922 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 RANDALLSTN MD
— 410-923 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 MILLERSVL MD
— 410-924 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 EASTON MD
— 410-925 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
— 410-926 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
— 410-927 1XXX3XXX5XXX6XXX8XXX · 2 holders which blocks → LEVEL 3 TELECOM OF MARYLAND, LLC - MD 7591 ODENTON MD
— 410-928 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → VERIZON MARYLAND, INC. 9212 MILLINGTON MD
— 410-930 not yet reported which blocks → REDI-CALL COMMUNICATIONS CO. 6810 WATERLO236 MD
— 410-931 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 PARKVILLE MD
— 410-932 not yet reported which blocks → SPOK, INC. 6630 ELKRIDGE MD
— 410-933 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 PARKVILLE MD
— 410-935 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
— 410-937 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FALLSTON MD
— 410-938 0XXX1XXX6XXX7XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-939 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 HAVREGRACE MD
— 410-942 2XXX3XXX4XXX5XXX6XXX9XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 HAVREGRACE MD
— 410-943 2XXX5XXX6XXX7XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 HURLOCK MD
— 410-944 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WOODLAWN MD
— 410-945 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-946 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 SEVERNA PK 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.