NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

7 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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 503
ONVOY, LLC - OR 4
NEW CINGULAR WIRELESS PCS, LLC 1
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 1
BANDWIDTH.COM CLEC, LLC - OR 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
2017-09-29 503-374-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TILLAMOOK OR
2017-09-29 503-374-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TILLAMOOK OR
2017-09-22 503-744-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CLACKAMAS OR
2017-09-20 503-592-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CANBYNEEDY OR
2017-09-20 503-732-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BEAVER CRK OR
2017-08-29 503-509-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 STAYTON OR
2017-08-29 503-979-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 STAYTON OR
2017-08-15 503-374-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TILLAMOOK OR
2017-08-10 503-898-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 REDLAND OR
2017-07-26 503-607-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CLACKAMAS OR
2017-07-26 503-744-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CLACKAMAS OR
2017-06-30 503-739-6XXX 6000–6999Assigned METROPCS, INC. 5562 SEASIDE OR
2017-06-26 503-509-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 STAYTON OR
2017-06-23 503-457-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 TILLAMOOK OR
2017-06-14 503-878-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J STFRD-SNDY OR
2017-06-09 503-406-0XXX 0000–0999Assigned METROPCS, INC. 5562 CLACKAMAS OR
2017-06-09 503-744-9XXX 9000–9999Assigned METROPCS, INC. 5562 CLACKAMAS OR
2017-06-09 503-766-7XXX 7000–7999Assigned METROPCS, INC. 5562 GRESHAM OR
2017-05-01 503-479-4XXX 4000–4999Assigned ONVOY, LLC - OR 750E CLACKAMAS OR
2017-03-30 503-387-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CLACKAMAS OR
2017-03-30 503-387-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CLACKAMAS OR
2017-03-30 503-387-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CLACKAMAS OR
2017-03-24 503-498-2XXX 2000–2999Assigned METROPCS, INC. 5562 STFRD-SNDY OR
2017-03-24 503-498-7XXX 7000–7999Assigned METROPCS, INC. 5562 STFRD-SNDY OR
2017-03-13 503-914-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J PORTLAND OR
2017-03-03 503-387-0XXX 0000–0999Assigned METROPCS, INC. 5562 CLACKAMAS OR
2017-03-03 503-406-5XXX 5000–5999Assigned METROPCS, INC. 5562 CLACKAMAS OR
2017-02-10 503-961-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PORTLAND OR
2017-01-04 503-354-3XXX 3000–3999Assigned ASTOUND BROADBAND, LLC - OR 936F TILLAMOOK OR
2016-11-30 503-498-0XXX 0000–0999Assigned METROPCS, INC. 5562 STFRD-SNDY OR
2016-10-14 503-765-0XXX 0000–0999Assigned METROPCS, INC. 5562 CLACKAMAS OR
2016-10-14 503-765-2XXX 2000–2999Assigned METROPCS, INC. 5562 CLACKAMAS OR
2016-10-14 503-765-4XXX 4000–4999Assigned METROPCS, INC. 5562 CLACKAMAS OR
2016-10-13 503-714-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 DAYTON OR
2016-09-29 503-509-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 STAYTON OR
2016-09-15 503-882-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J CLACKAMAS OR
2016-09-08 503-660-4XXX 4000–4999Assigned PEERLESS NETWORK OF OREGON, LLC - OR 157F GRESHAM OR
2016-08-09 503-607-6XXX 6000–6999Assigned METROPCS, INC. 5562 CLACKAMAS OR
2016-08-09 503-607-9XXX 9000–9999Assigned METROPCS, INC. 5562 CLACKAMAS OR
2016-07-27 503-663-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - OR 076F GRESHAM OR
2016-07-27 503-912-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - OR 076F GRESHAM OR
2016-06-29 503-855-0XXX 0000–0999Assigned ONVOY, LLC - OR 750E STFRD-SNDY OR
2016-06-28 503-328-5XXX 5000–5999Assigned METROPCS, INC. 5562 GRESHAM OR
2016-06-28 503-573-7XXX 7000–7999Assigned METROPCS, INC. 5562 GRESHAM OR
2016-05-25 503-457-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 TILLAMOOK OR
2016-05-06 503-744-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J CLACKAMAS OR
2016-05-06 503-878-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J STFRD-SNDY OR
2016-04-13 503-714-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - OR 076F DAYTON OR
2016-04-05 503-509-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 STAYTON OR
2016-04-05 503-907-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 GRESHAM OR

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.