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
2014-10-28 240-517 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL238 MD
2014-10-07 240-618 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSNGTNZN10 MD
2014-10-07 240-702 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GAITHERSBG MD
2014-09-22 240-219 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G RIDGE MD
2014-09-11 240-609 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CUMBERLAND MD
2014-05-22 240-901 0–9 XXXall 10 · 7 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J LA PLATA MD
2013-12-03 240-903 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J INDIANHEAD MD
2013-11-15 240-716 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN5 MD
2013-10-29 240-495 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN4 MD
2013-10-29 240-532 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN5 MD
2013-10-04 240-801 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GAITHERSBG MD
2013-09-17 240-360 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 LAUREL236 MD
2013-07-16 240-614 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 WSNGTNZN10 MD
2013-05-29 240-615 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 WSHNGTNZN4 MD
2013-05-10 240-802 0–9 XXXall 10 · 7 holders which blocks → NUSO, LLC 551G WSHNGTNZN2 MD
2013-04-25 240-467 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J WSHNGTNZN4 MD
2013-04-09 240-503 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G TOMPKINSVL MD
2013-03-11 240-608 0–9 XXXall 10 · 6 holders which blocks → NUSO, LLC 551G FREDERICK MD
2012-09-10 240-224 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GAITHERSBG MD
2012-09-10 240-309 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LEONARDTN MD
2012-08-22 240-762 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN2 MD
2012-06-22 240-800 0–9 XXXall 10 · 7 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN2 MD
2012-06-08 240-708 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 LAUREL238 MD
2012-05-16 240-488 0–9 XXXall 10 · 8 holders which blocks → SHENTEL COMMUNICATIONS, LLC. - MD 836G OAKLAND MD
2012-04-05 240-613 0–9 XXXwhole prefix which blocks → PAETEC ITEL, LLC 829J WSHNGTNZN4 MD
2012-03-22 240-734 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F SMITHSBURG MD
2012-01-27 240-707 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HAGERSTOWN MD
2012-01-27 240-803 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CUMBERLAND MD
2011-11-17 240-650 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MD 876D WSHNGTNZN3 MD
2011-11-17 240-772 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FREDERICK MD
2011-11-11 240-754 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WALDORF MD
2011-11-10 240-265 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN2 MD
2011-11-10 240-272 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN2 MD
2011-11-07 240-270 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WALDORF MD
2011-11-02 240-713 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G LAUREL236 MD
2011-11-01 240-712 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL238 MD
2011-10-31 240-630 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN2 MD
2011-10-19 240-513 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HAGERSTOWN MD
2011-10-04 240-203 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HAGERSTOWN MD
2011-10-04 240-234 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN2 MD
2011-10-04 240-458 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WALDORF MD
2011-10-04 240-470 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL236 MD
2011-10-04 240-504 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2011-09-07 240-204 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN2 MD
2011-09-07 240-444 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL236 MD
2011-08-18 240-340 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN2 MD
2011-08-18 240-400 0–9 XXXall 10 · 6 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN2 MD
2011-08-15 240-438 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2011-07-08 240-278 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL236 MD
2011-07-08 240-578 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FREDERICK 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.