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
2016-09-02 240-913 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - MD 876D DAMASCS240 MD
2016-08-25 240-877 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MD 876D FREDERICK MD
2016-08-23 240-860 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G CUMBERLAND MD
2016-08-02 240-971 0–9 XXXall 10 · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J FREDERICK MD
2016-07-12 240-858 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN2 MD
2016-07-12 240-907 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSNGTNZN10 MD
2016-07-11 240-859 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - MD 876D ASHTON238 MD
2016-07-01 240-592 0–9 XXXwhole prefix which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z13 MD
2016-06-23 240-904 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL238 MD
2016-05-25 240-850 0–9 XXXall 10 · 6 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G HAGERSTOWN MD
2016-04-26 240-831 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MD 876D FREDERICK MD
2016-04-11 240-534 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN2 MD
2016-04-11 240-719 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN5 MD
2016-04-11 240-856 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL238 MD
2016-04-05 240-810 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN10 MD
2016-03-17 240-496 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LEONARDTN MD
2016-03-17 240-549 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FREDERICK MD
2016-03-17 240-825 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN4 MD
2016-03-03 240-758 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LAUREL236 MD
2016-02-24 240-570 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MD 876D ASHTON238 MD
2016-02-18 240-771 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MD 876D POOLESVL MD
2016-01-12 240-817 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ASHTON236 MD
2016-01-06 240-657 0–9 XXXall 10 · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 FROSTBURG MD
2015-12-23 240-261 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - MD 876D GAITHERSBG MD
2015-12-09 240-847 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MD 876D WSHNGTNZN3 MD
2015-11-17 240-805 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GAITHERSBG MD
2015-11-17 240-815 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FREDERICK MD
2015-11-12 240-732 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MOUNT AIRY MD
2015-11-12 240-917 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LAUREL236 MD
2015-11-10 240-830 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J WSHNGTNZN5 MD
2015-10-05 240-774 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F LONACONING MD
2015-10-05 240-775 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F WESTERNPT MD
2015-10-05 240-816 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F KEEDYSVL MD
2015-10-01 240-763 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F WSNG238Z15 MD
2015-09-30 240-806 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G INDIANHEAD MD
2015-09-22 240-760 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN2 MD
2015-09-03 240-740 0–9 XXXwhole prefix which blocks → ATLANTECH ONLINE, INC. - MD 361H WSNGTNZN10 MD
2015-08-18 240-781 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN2 MD
2015-07-16 240-617 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F HIGHFIELD MD
2015-06-12 240-562 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 GAITHERSBG MD
2015-06-02 240-970 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - MD 876D WSNGTNZN12 MD
2015-05-26 240-972 0–9 XXXall 10 · 4 holders which blocks → BALTIMORE-WASHINGTON TELEPHONE (BWT) 8697 LAUREL238 MD
2015-05-22 240-474 0–9 XXXall 10 · 5 holders which blocks → BALTIMORE-WASHINGTON TELEPHONE (BWT) 8697 GAITHERSBG MD
2015-05-22 240-633 0–9 XXXall 10 · 6 holders which blocks → BALTIMORE-WASHINGTON TELEPHONE (BWT) 8697 HUGHESVL MD
2015-05-21 240-661 0–9 XXXall 10 · 6 holders which blocks → BALTIMORE-WASHINGTON TELEPHONE (BWT) 8697 LXTNPKGRML MD
2015-03-31 240-660 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSNGTNZN10 MD
2015-03-31 240-808 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LEONARDTN MD
2015-02-20 240-714 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN4 MD
2015-02-18 240-900 0–9 XXXwhole prefix which blocks → ONVOY, LLC - MD 876D WSHNGTNZN4 MD
2014-12-08 240-623 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN4 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.