NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

17 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 443
ONVOY, LLC - MD 8
NEW CINGULAR WIRELESS PCS, LLC - DC 4
VERSATEL LLC 1
OPENTACT INC. 1
LEVEL 3 COMMUNICATIONS, 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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2013-12-20 443-290-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J PARKVILLE MD
2013-12-20 443-325-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J ELLICOTTCY MD
2013-12-05 443-679-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SEVERN MD
2013-12-04 443-905-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2013-11-27 443-432-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 PRINCEFRCK MD
2013-11-27 443-653-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 PARKVILLE MD
2013-11-27 443-779-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ABERDEEN MD
2013-11-27 443-985-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 RANDALLSTN MD
2013-11-20 443-905-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2013-11-12 443-251-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 CATONSVL MD
2013-11-12 443-365-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 SALISBURY MD
2013-11-07 443-207-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 6626 ELKTON MD
2013-11-07 443-948-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2013-11-01 443-201-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J WESTMINSTR MD
2013-10-28 443-818-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ARGRGBSNIS MD
2013-10-28 443-905-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2013-10-28 443-905-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2013-10-18 443-334-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J PIKESVILLE MD
2013-10-18 443-689-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J COCKEYSVL MD
2013-09-20 443-412-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J CHURCHVL MD
2013-09-20 443-906-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J SEVERNA PK MD
2013-09-17 443-400-1XXX 1000–1999Assigned METROPCS, INC. 5562 BRYNPKLNCM MD
2013-09-17 443-400-4XXX 4000–4999Assigned METROPCS, INC. 5562 BRYNPKLNCM MD
2013-09-17 443-522-3XXX 3000–3999Assigned METROPCS, INC. 5562 REISTERSTN MD
2013-09-12 443-214-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2013-09-12 443-733-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J WATERLO238 MD
2013-09-12 443-770-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ARGRGBSNIS MD
2013-09-10 443-272-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J RANDALLSTN MD
2013-09-10 443-400-9XXX 9000–9999Assigned METROPCS, INC. 5562 BRYNPKLNCM MD
2013-09-09 443-815-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J ESSEX MD
2013-09-06 443-214-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J ANNAPOLIS MD
2013-09-06 443-301-0XXX 0000–0999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 BALTIMORE MD
2013-09-06 443-301-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 BALTIMORE MD
2013-09-06 443-371-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J BEL AIR MD
2013-09-04 443-905-4XXX 4000–4999Assigned LEVEL 3 TELECOM OF MARYLAND, LLC - MD 7591 ANNAPOLIS MD
2013-09-04 443-905-5XXX 5000–5999Assigned LEVEL 3 TELECOM OF MARYLAND, LLC - MD 7591 ANNAPOLIS MD
2013-09-04 443-945-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ELKTON MD
2013-08-28 443-873-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 BALTIMORE MD
2013-08-26 443-486-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J PRINCEFRCK MD
2013-08-23 443-205-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 CAMBRIDGE MD
2013-08-23 443-259-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J COLUMBIA MD
2013-08-23 443-905-3XXX 3000–3999Assigned LEVEL 3 TELECOM OF MARYLAND, LLC - MD 7591 ANNAPOLIS MD
2013-08-20 443-251-1XXX 1000–1999Assigned IP HORIZON LLC 515J CATONSVL MD
2013-08-15 443-846-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F TOWSON MD
2013-08-13 443-330-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F COCKEYSVL MD
2013-08-13 443-598-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F SHERWD FOR MD
2013-08-13 443-952-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 WESTMINSTR MD
2013-08-12 443-201-0XXX 0000–0999Assigned IP HORIZON LLC 515J WESTMINSTR MD
2013-08-12 443-214-1XXX 1000–1999Assigned IP HORIZON LLC 515J ANNAPOLIS MD
2013-08-12 443-290-1XXX 1000–1999Assigned IP HORIZON LLC 515J PARKVILLE 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.