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
2019-05-22 423-597 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - TN 124F BENTON TN
2019-05-22 438-251 not yet reported which blocks → Bell Mobility 6574 Montreal —
2019-05-22 469-653 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F ROCKWALL TX
2019-05-22 470-531 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - GA 983E ATLANTA NW GA
2019-05-22 561-476 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - FL 982E BOCA RATON FL
2019-05-22 561-725 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H WPALMBEACH FL
2019-05-22 562-504 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 WHITTIER CA
2019-05-22 620-882 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - KS 8995 COLDWATER KS
2019-05-22 720-797 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CO 078F KEENESBURG CO
2019-05-22 754-732 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H FTLAUDERDL FL
2019-05-22 772-348 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H PTST LUCIE FL
2019-05-22 772-666 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H FORTPIERCE FL
2019-05-22 772-837 0–9 XXXall 10 · 6 holders which blocks → CORETEL FLORIDA, INC. - FL 481F PTST LUCIE FL
2019-05-22 786-988 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H MIAMI FL
2019-05-22 804-877 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H RICHMOND VA
2019-05-22 929-526 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E NWYRCYZN03 NY
2019-05-21 213-371 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 03 CA
2019-05-21 254-500 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H TEMPLE TX
2019-05-21 254-529 3XXX9XXX which blocks → FRACTEL, LLC 965H WACO TX
2019-05-21 318-788 0XXX2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → FRACTEL, LLC 965H HOSSTON LA
2019-05-21 318-877 0XXX2XXX3XXX7XXX8XXX · 4 holders which blocks → FRACTEL, LLC 965H BELCHER LA
2019-05-21 318-977 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H MONROE LA
2019-05-21 346-465 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H LANGHAMCRK TX
2019-05-21 346-529 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H HSTNSUBURB TX
2019-05-21 346-732 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H CYPRESS TX
2019-05-21 346-758 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H RICHMNRNBG TX
2019-05-21 346-766 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H HOUSTON TX
2019-05-21 346-842 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H HUMBLE TX
2019-05-21 346-877 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H DEER PARK TX
2019-05-21 346-988 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H CLEVELAND TX
2019-05-21 424-431 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E BEVERLYHLS CA
2019-05-21 430-666 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H DENISON TX
2019-05-21 504-877 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H NEWORLEANS LA
2019-05-21 504-977 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H VENICE LA
2019-05-21 581-864 not yet reported which blocks → Videotron Ltd. 8306 Saint-Gedeon-de-Beauce —
2019-05-21 646-970 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E NWYRCYZN01 NY
2019-05-21 647-431 not yet reported which blocks → Bell Mobility 6574 Toronto —
2019-05-21 647-433 not yet reported which blocks → Bell Mobility 6574 Toronto —
2019-05-21 647-434 not yet reported which blocks → Bell Mobility 6574 Toronto —
2019-05-21 657-382 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2019-05-21 657-402 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2019-05-21 737-356 0–9 XXXall 10 · 7 holders which blocks → FRACTEL, LLC 965H GEORGETOWN TX
2019-05-21 737-373 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H SAN MARCOS TX
2019-05-21 737-465 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H AUSTIN TX
2019-05-21 737-758 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H KEMPNER TX
2019-05-21 737-766 0–9 XXXall 10 · 8 holders which blocks → FRACTEL, LLC 965H LEANDER TX
2019-05-21 775-567 0–9 XXXall 10 · 7 holders which blocks → FRACTEL, LLC 965H RENO NV
2019-05-21 848-272 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - NJ 118F ATLATCHLDS NJ
2019-05-21 914-386 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H MOUNTKISCO NY
2019-05-21 914-639 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H WSCHSTZN01 NY

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.