NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

11 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 331
ONVOY, LLC 6
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 3
NEW CINGULAR WIRELESS PCS, LLC - IL 1
BANDWIDTH.COM CLEC, LLC - IL 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
2020-01-25 331-732-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 GENEVA IL
2020-01-25 331-732-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 GENEVA IL
2020-01-25 331-732-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 GENEVA IL
2020-01-25 331-732-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 GENEVA IL
2020-01-23 331-257-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AURORA IL
2020-01-10 331-258-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2019-12-20 331-241-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LOMBARD IL
2019-12-16 331-258-5XXX 5000–5999Assigned ONVOY, LLC 224C AURORA IL
2019-12-16 331-258-8XXX 8000–8999Assigned ONVOY, LLC 224C AURORA IL
2019-10-18 331-258-1XXX 1000–1999Assigned ONVOY, LLC 224C AURORA IL
2019-10-18 331-258-3XXX 3000–3999Assigned ONVOY, LLC 224C AURORA IL
2019-10-17 331-249-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NAPERVILLE IL
2019-10-14 331-336-8XXX 8000–8999Assigned FRACTEL, LLC 965H AURORA IL
2019-10-14 331-348-6XXX 6000–6999Assigned FRACTEL, LLC 965H ELBURN IL
2019-10-14 331-732-5XXX 5000–5999Assigned FRACTEL, LLC 965H GENEVA IL
2019-10-11 331-356-7XXX 7000–7999Assigned FRACTEL, LLC 965H BARTLETT IL
2019-10-11 331-356-8XXX 8000–8999Assigned FRACTEL, LLC 965H BARTLETT IL
2019-09-23 331-666-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AURORA IL
2019-09-23 331-666-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AURORA IL
2019-09-19 331-666-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AURORA IL
2019-09-13 331-249-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J NAPERVILLE IL
2019-09-04 331-900-3XXX 3000–3999Assigned ONVOY, LLC 224C ELMHURST IL
2019-09-04 331-900-4XXX 4000–4999Assigned ONVOY, LLC 224C ELMHURST IL
2019-09-04 331-900-5XXX 5000–5999Assigned ONVOY, LLC 224C ELMHURST IL
2019-09-03 331-400-1XXX 1000–1999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E OSWEGO IL
2019-08-27 331-241-4XXX 4000–4999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E LOMBARD IL
2019-08-21 331-239-2XXX 2000–2999Assigned TELNYX LLC 073H YORKVILLE IL
2019-08-09 331-258-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AURORA IL
2019-08-09 331-259-2XXX 2000–2999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E SUGARGROVE IL
2019-08-09 331-400-0XXX 0000–0999Assigned FRACTEL, LLC 965H OSWEGO IL
2019-08-09 331-400-4XXX 4000–4999Assigned FRACTEL, LLC 965H OSWEGO IL
2019-08-09 331-529-3XXX 3000–3999Assigned FRACTEL, LLC 965H NAPERVILLE IL
2019-08-09 331-529-9XXX 9000–9999Assigned FRACTEL, LLC 965H NAPERVILLE IL
2019-08-09 331-600-0XXX 0000–0999Assigned FRACTEL, LLC 965H WHEATON IL
2019-08-09 331-600-6XXX 6000–6999Assigned FRACTEL, LLC 965H WHEATON IL
2019-08-09 331-900-0XXX 0000–0999Assigned FRACTEL, LLC 965H ELMHURST IL
2019-08-09 331-900-9XXX 9000–9999Assigned FRACTEL, LLC 965H ELMHURST IL
2019-08-07 331-808-5XXX 5000–5999Assigned ONVOY, LLC 224C PLANO IL
2019-08-05 331-236-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 WHEATON IL
2019-06-21 331-261-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 LEMONT IL
2019-06-20 331-241-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LOMBARD IL
2019-06-18 331-239-7XXX 7000–7999Assigned ONVOY, LLC 224C YORKVILLE IL
2019-06-18 331-239-8XXX 8000–8999Assigned ONVOY, LLC 224C YORKVILLE IL
2019-06-18 331-246-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 LEMONT IL
2019-06-18 331-246-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LEMONT IL
2019-06-18 331-246-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 LEMONT IL
2019-06-18 331-246-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LEMONT IL
2019-06-18 331-246-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 LEMONT IL
2019-06-18 331-246-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LEMONT IL
2019-06-18 331-246-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LEMONT IL

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.