NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

1 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.

Most active assignees, last 30 days — NPA 301
ONVOY, LLC - MD 1
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 thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2011-04-20 301-909-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN5 MD
2011-04-20 301-909-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN5 MD
2011-04-20 301-920-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN3 MD
2011-04-20 301-960-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN3 MD
2011-04-20 301-960-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN3 MD
2011-04-18 301-244-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J WSHNGTNZN3 MD
2011-04-18 301-288-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J WSNGTNZN12 MD
2011-04-13 301-500-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN2 MD
2011-04-13 301-500-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN2 MD
2011-04-08 301-202-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN2 MD
2011-04-08 301-202-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN2 MD
2011-04-08 301-202-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN2 MD
2011-04-08 301-569-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F GAITHERSBG MD
2011-04-06 301-500-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN2 MD
2011-04-04 301-852-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN4 MD
2011-03-25 301-288-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSNGTNZN12 MD
2011-03-24 301-909-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN5 MD
2011-03-15 301-304-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J WALKERSVL MD
2011-03-03 301-800-6XXX 6000–6999Assigned METROPCS, INC. 5562 HAGERSTOWN MD
2011-03-03 301-956-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. - MD 281E GAITHERSBG MD
2011-03-03 301-956-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. - MD 281E GAITHERSBG MD
2011-03-01 301-200-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F INDIANHEAD MD
2011-03-01 301-494-4XXX 4000–4999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSNG238Z15 MD
2011-02-28 301-338-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CUMBERLAND MD
2011-02-28 301-338-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CUMBERLAND MD
2011-02-28 301-800-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HAGERSTOWN MD
2011-02-28 301-800-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HAGERSTOWN MD
2011-02-28 301-800-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HAGERSTOWN MD
2011-02-24 301-337-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J GAITHERSBG MD
2011-02-22 301-378-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J FREDERICK MD
2011-02-18 301-684-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 INDIANHEAD MD
2011-01-31 301-883-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN5 MD
2011-01-21 301-355-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. - MD 281E GAITHERSBG MD
2011-01-19 301-683-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN4 MD
2011-01-19 301-683-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN4 MD
2011-01-17 301-777-6XXX 6000–6999Assigned VERIZON MARYLAND, INC. 9212 CUMBERLAND MD
2011-01-13 301-836-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN5 MD
2011-01-10 301-747-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN6 MD
2011-01-04 301-852-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN4 MD
2011-01-04 301-852-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN4 MD
2011-01-03 301-355-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 GAITHERSBG MD
2010-12-30 301-274-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J HUGHESVL MD
2010-12-30 301-290-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J MECHANCSVL MD
2010-12-30 301-349-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J POOLESVL MD
2010-12-22 301-799-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J KEEDYSVL MD
2010-12-22 301-836-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN5 MD
2010-12-17 301-250-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 GAITHERSBG MD
2010-12-14 301-448-4XXX 4000–4999Assigned BALTIMORE-WASHINGTON TELEPHONE (BWT) 8697 WSHNGTNZN3 MD
2010-12-10 301-836-4XXX 4000–4999Assigned LEVEL 3 TELECOM OF MARYLAND, LLC - MD 7591 WSHNGTNZN5 MD
2010-12-07 301-660-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F KEEDYSVL MD

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.