NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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, last 30 days
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
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
2018-09-05 475-251 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANSONIDRBY CT
2018-09-05 579-499 not yet reported which blocks → Telebec Ltee. 8239 Notre-Dame-de-Stanbridge —
2018-09-05 579-757 not yet reported which blocks → Telebec Ltee. 8239 Contrecoeur —
2018-09-05 579-848 not yet reported which blocks → Telebec Ltee. 8239 St-Thomas-d'Aquin —
2018-09-05 581-412 not yet reported which blocks → Telebec Ltee. 8239 Chateau-Richer —
2018-09-05 581-556 not yet reported which blocks → Telebec Ltee. 8239 Disraeli —
2018-09-05 873-256 not yet reported which blocks → Telebec Ltee. 8239 La Tuque —
2018-09-05 873-340 not yet reported which blocks → Telebec Ltee. 8239 Shawville —
2018-09-05 873-525 not yet reported which blocks → Telebec Ltee. 8239 Arthabaska —
2018-09-05 873-620 not yet reported which blocks → Telebec Ltee. 8239 St-Cyrille —
2018-09-05 873-722 not yet reported which blocks → Telebec Ltee. 8239 Becancour —
2018-09-05 873-876 not yet reported which blocks → Telebec Ltee. 8239 Woburn —
2018-09-05 873-980 not yet reported which blocks → Telebec Ltee. 8239 Mont-Laurier —
2018-09-04 223-308 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - PA 4007 MILLERSVL PA
2018-09-04 236-547 not yet reported which blocks → TELUS 8086 White Rock —
2018-09-04 267-624 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PHLDLPHZN2 PA
2018-09-04 385-420 0–9 XXXall 10 · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2018-09-04 417-408 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 SPRINGFLD MO
2018-09-04 431-858 not yet reported which blocks → LES.NET (1996) Inc. 141F Hartney —
2018-09-04 626-479 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 COVINA CA
2018-09-04 681-243 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WV 9944 WELLSBURG WV
2018-09-04 682-273 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F ARLINGTON TX
2018-09-04 732-314 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 SOUTHRIVER NJ
2018-09-04 774-376 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 CARVER MA
2018-09-04 864-533 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SC 6398 CLEMSON SC
2018-08-31 279-201 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CA 649C FAIR OAKS CA
2018-08-31 313-816 0–9 XXXall 10 · 2 holders which blocks → AIRUS, INC. - MI 948H DETROITZN1 MI
2018-08-31 405-934 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
2018-08-31 438-421 not yet reported which blocks → Bell Mobility 6574 Montreal —
2018-08-31 470-648 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - GA 983E ATLANTA NW GA
2018-08-31 510-617 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CA 649C HRCUL-RODE CA
2018-08-31 539-325 0–9 XXXall 10 · 8 holders which blocks → CROSS CABLE TELEVISION, LLC - OK 809H TULSA OK
2018-08-31 585-440 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E CHURCHVL NY
2018-08-31 610-412 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PUGHTOWN PA
2018-08-31 707-503 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - CA 649C SEBASTOPOL CA
2018-08-31 928-900 0–9 XXXall 10 · 6 holders which blocks → TERRA NOVA TELECOM INC. 145J GLOBE AZ
2018-08-31 929-487 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E NWYRCYZN08 NY
2018-08-31 947-209 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TROY MI
2018-08-30 206-507 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
2018-08-30 223-747 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - PA 547E EASTBERLIN PA
2018-08-30 346-358 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - TX 903C LEAGUECITY TX
2018-08-30 346-359 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - TX 903C LIVERPOOL TX
2018-08-30 346-361 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - TX 903C SEABROOK TX
2018-08-30 346-362 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - TX 903C SHELDON TX
2018-08-30 361-366 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - TX 903C SAN DIEGO TX
2018-08-30 423-556 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - TN 124F SODDYDAISY TN
2018-08-30 423-565 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - TN 124F DECATUR TN
2018-08-30 463-212 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
2018-08-30 469-545 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F MCKINNEY TX
2018-08-30 639-995 not yet reported which blocks → TELUS Mobility 8303 Neilburg —

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.