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 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
2021-02-10 240-703 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ASHTON236 MD
2021-02-10 240-756 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN10 MD
2021-01-21 240-885 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MD 876D WSNGTNZN10 MD
2021-01-14 240-571 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL238 MD
2021-01-13 240-410 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 CUMBERLAND MD
2021-01-12 240-749 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL238 MD
2020-12-23 240-748 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 WSHNGTNZN3 MD
2020-12-04 240-746 0–9 XXXall 10 · 6 holders which blocks → AT&T - LOCAL 7421 BRANDYWINE MD
2020-11-20 240-742 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 478J WSNG238Z14 MD
2020-11-06 240-443 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MD 876D WSHNGTNZN6 MD
2020-11-06 240-945 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MD 876D WSHNGTNZN3 MD
2020-11-06 240-956 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MD 876D WSHNGTNZN2 MD
2020-10-01 240-741 0–9 XXXall 10 · 5 holders which blocks → AIRESPRING, INC. 996H FREDERICK MD
2020-09-15 240-739 0–9 XXXall 10 · 7 holders which blocks → IP HORIZON LLC 515J FREDERICK MD
2020-09-03 240-738 0XXX1XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 HANCOCK MD
2020-09-02 240-736 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LAUREL236 MD
2020-09-01 240-726 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 478J WSHNGTNZN4 MD
2020-09-01 240-735 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 478J BRUNSWICK MD
2020-08-27 240-574 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 FRIENDSVL MD
2020-08-12 240-730 0–9 XXXall 10 · 5 holders which blocks → HD CARRIER LLC 321J HAGERSTOWN MD
2020-07-16 240-226 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MD 876D OAKLAND MD
2020-07-16 240-851 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 5 holders which blocks → ONVOY, LLC - MD 876D MCCOOLE MD
2020-07-15 240-733 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H ASHTON236 MD
2020-07-15 240-922 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H WSNGTNZN11 MD
2020-07-02 240-240 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H DAMASCS240 MD
2020-06-26 240-799 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → FRACTEL, LLC 965H BRANDYWINE MD
2020-06-16 240-729 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ASHTON236 MD
2020-06-09 240-301 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - MD 876D CLEAR SPG MD
2020-05-28 240-202 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - MD 876D HIGHFIELD MD
2020-05-12 240-728 0–9 XXXall 10 · 3 holders which blocks → VONAGE AMERICA LLC 197D WSNGTNZN10 MD
2020-05-08 240-995 1XXX2XXX3XXX5XXX6XXX7XXX · 3 holders which blocks → ONVOY, LLC - MD 876D FLINTSTONE MD
2020-03-19 240-721 0–9 XXXall 10 · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN5 MD
2019-12-30 240-710 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 FREDERICK MD
2019-10-25 240-709 0–9 XXXall 10 · 7 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 LAUREL236 MD
2019-10-15 240-698 0–9 XXXall 10 · 6 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 MYERSVILLE MD
2019-10-10 240-873 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MD 876D BUCKEYSTN MD
2019-10-10 240-874 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MD 876D THURMONT MD
2019-10-10 240-875 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MD 876D MOUNT AIRY MD
2019-09-25 240-693 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G WALKERSVL MD
2019-09-20 240-866 0–9 XXXall 10 · 6 holders which blocks → TERRA NOVA TELECOM INC. 145J HAGERSTOWN MD
2019-09-12 240-697 0–9 XXXall 10 · 3 holders which blocks → CORETEL MARYLAND, INC. - MD 469J MECHANCSVL MD
2019-09-12 240-829 0–9 XXXall 10 · 6 holders which blocks → CORETEL MARYLAND, INC. - MD 469J EMMITSBURG MD
2019-08-30 240-656 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 FREDERICK MD
2019-05-30 240-692 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 GRANTSVL MD
2019-05-28 240-689 0–9 XXXall 10 · 6 holders which blocks → CSC WIRELESS, LLC 425J WSNG236Z15 MD
2019-05-20 240-677 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN5 MD
2019-05-17 240-673 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN2 MD
2019-03-06 240-664 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G CUMBERLAND MD
2019-01-30 240-659 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ASHTON236 MD
2019-01-30 240-663 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 MIDDLETOWN 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.