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 240
OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 117
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 85
NEW CINGULAR WIRELESS PCS, LLC - DC 69
PAETEC ITEL, LLC 63
LEVEL 3 COMMUNICATIONS, LLC - MD 59
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
2022-01-11 240-914 8XXX9XXX · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J HIGHFIELD MD
2022-01-10 240-905 0XXX1XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 BRANDYWINE MD
2021-12-28 240-896 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J HAGERSTOWN MD
2021-12-28 240-902 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TWILIO INTERNATIONAL, INC. 506J DAMASCS240 MD
2021-12-10 240-891 0XXX1XXX2XXX4XXX5XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 DAMASCS240 MD
2021-12-10 240-894 0XXX1XXX8XXX9XXX · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J LXTNPKGRML MD
2021-12-07 240-854 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN4 MD
2021-12-07 240-887 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ASHTON236 MD
2021-12-07 240-890 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN5 MD
2021-12-06 240-889 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN10 MD
2021-11-17 240-886 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN4 MD
2021-11-04 240-881 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F WSNG238Z13 MD
2021-10-25 240-946 0–9 XXXall 10 · 8 holders which blocks → FRACTEL, LLC 965H WSNG236Z14 MD
2021-10-07 240-861 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ASHTON236 MD
2021-10-07 240-869 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN10 MD
2021-10-07 240-871 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 LXTNPKGRML MD
2021-10-07 240-872 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN6 MD
2021-10-07 240-879 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN4 MD
2021-09-28 240-853 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F LAUREL236 MD
2021-09-13 240-852 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 MYERSVILLE MD
2021-09-08 240-849 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 HAGERSTOWN MD
2021-09-01 240-798 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - MD 876D GAITHERSBG MD
2021-09-01 240-807 0–9 XXXall 10 · 6 holders which blocks → USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD 4720 CUMBERLAND MD
2021-09-01 240-809 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MD 876D SMITHSBURG MD
2021-09-01 240-819 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - MD 876D WILLIAMSPT MD
2021-09-01 240-827 2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → ONVOY, LLC - MD 876D LONACONING MD
2021-09-01 240-836 2XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → ONVOY, LLC - MD 876D MT SAVAGE MD
2021-08-25 240-796 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN10 MD
2021-08-25 240-797 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ASHTON236 MD
2021-08-12 240-795 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN5 MD
2021-08-11 240-791 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN4 MD
2021-08-11 240-792 0–9 XXXall 10 · 6 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 FREDERICK MD
2021-08-10 240-789 0–9 XXXall 10 · 6 holders which blocks → ADVANCED TELECOM SOLUTIONS, LLC 181J WSNGTNZN10 MD
2021-07-20 240-761 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LAUREL236 MD
2021-07-20 240-769 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F KEEDYSVL MD
2021-07-20 240-785 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F OAKLAND MD
2021-06-03 240-835 0–9 XXXall 10 · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H CLEAR SPG MD
2021-04-29 240-884 0XXX2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H TOMPKINSVL MD
2021-04-22 240-259 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H HUGHESVL MD
2021-04-22 240-717 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H LEONARDTN MD
2021-04-22 240-768 5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H NANJEMOY MD
2021-03-25 240-759 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MD 876D WSNG238Z15 MD
2021-03-25 240-820 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC - MD 876D ASHTON238 MD
2021-03-15 240-822 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MD 876D NEW MARKET MD
2021-03-15 240-824 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MD 876D FROSTBURG MD
2021-03-15 240-834 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MD 876D KITZMILLER MD
2021-03-15 240-942 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → ONVOY, LLC - MD 876D BITTINGER MD
2021-03-15 240-944 0XXX1XXX2XXX3XXX5XXX6XXX8XXX · 3 holders which blocks → ONVOY, LLC - MD 876D WESTERNPT MD
2021-03-03 240-910 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - MD 876D FREDERICK MD
2021-02-12 240-934 0–9 XXXall 10 · 6 holders which blocks → TON80 COMMUNICATIONS, LLC 516J MIDDLETOWN 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.