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
2018-12-06 315-881 0XXX1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E MORAVIA NY
2018-12-06 425-620 0–9 XXXall 10 · 3 holders which blocks → VONAGE AMERICA LLC 197D BELLEVUE WA
2018-12-06 469-588 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 FRISCO TX
2018-12-06 540-417 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - VA 138E MCGAHEYSVL VA
2018-12-06 579-537 not yet reported which blocks → Videotron Ltd. 8306 Bedford —
2018-12-06 579-538 not yet reported which blocks → Videotron Ltd. 8306 Lacolle —
2018-12-06 605-827 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → VALLEY COMMUNICATIONS, INC. D/B/A VALLEY FIBERCOM 363J VOLGA SD
2018-12-06 657-368 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 WESTMINSTR CA
2018-12-06 862-337 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 CHATHAM NJ
2018-12-06 909-701 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 UPLAND CA
2018-12-06 959-206 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D HARTFORD CT
2018-12-05 224-296 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC 224C EVANSTON IL
2018-12-05 224-298 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC 224C GRAYSLAKE IL
2018-12-05 229-596 0–9 XXXall 10 · 3 holders which blocks → PINELAND COMMUNICATIONS, INC. - GA 458G AMERICUS GA
2018-12-05 262-731 0–9 XXXall 10 · 6 holders which blocks → VONAGE AMERICA LLC 197D WHITEWATER WI
2018-12-05 331-249 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC 224C NAPERVILLE IL
2018-12-05 430-248 not yet reported which blocks → SHELCOMM 0051 GREENVILLE TX
2018-12-05 440-581 0–9 XXXall 10 · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 ELYRIA OH
2018-12-05 534-344 0–9 XXXwhole prefix which blocks → ONVOY, LLC - WI 225C WHITEHALL WI
2018-12-05 534-544 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - WI 225C HUDSON WI
2018-12-05 628-264 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2018-12-05 682-280 not yet reported which blocks → SHELCOMM 0051 FORT WORTH TX
2018-12-05 779-262 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC 224C OGLESBY IL
2018-12-05 940-288 not yet reported which blocks → SHELCOMM 0051 DENTON TX
2018-12-04 213-460 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C LSAN DA 06 CA
2018-12-04 234-266 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F WADSWORTH OH
2018-12-04 236-955 not yet reported which blocks → Bell Mobility 6574 Vancouver —
2018-12-04 240-658 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D GAITHERSBG MD
2018-12-04 385-286 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
2018-12-04 458-238 0–9 XXXwhole prefix which blocks → LTE WIRELESS, INC. - OR 379J BANDON OR
2018-12-04 531-229 0–9 XXXall 10 · 4 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 LINCOLN NE
2018-12-04 540-917 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BERRYVILLE VA
2018-12-04 579-536 not yet reported which blocks → Videotron Ltd. 8306 Napierville —
2018-12-04 618-626 0XXX1XXX2XXX3XXX6XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 DU QUOIN IL
2018-12-04 707-717 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - CA 649C FORTUNA CA
2018-12-04 707-801 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - CA 649C KENWOOD CA
2018-12-04 878-213 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - PA 002F PTTSBGZON1 PA
2018-12-04 939-296 0XXX1XXX2XXX3XXX9XXX · 5 holders which blocks → NATURAL G.C. INC. - PR 985G JUNCOS PR
2018-12-04 939-412 0XXX1XXX2XXX3XXX4XXX · 3 holders which blocks → NATURAL G.C. INC. - PR 985G LEVITTOWN PR
2018-12-04 939-445 0XXX1XXX3XXX4XXX5XXX7XXX · 6 holders which blocks → NATURAL G.C. INC. - PR 985G GUANICA PR
2018-12-04 939-592 0–9 XXXall 10 · 3 holders which blocks → NATURAL G.C. INC. - PR 985G BAYAMONSUR PR
2018-12-04 939-985 0XXX2XXX8XXX · 3 holders which blocks → NATURAL G.C. INC. - PR 985G COMERIO PR
2018-12-04 971-346 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J PORTLAND OR
2018-12-03 236-454 not yet reported which blocks → TELUS 8086 Richmond —
2018-12-03 469-572 not yet reported which blocks → SHELCOMM 0051 DALLAS TX
2018-12-03 505-522 0–9 XXXall 10 · 3 holders which blocks → VONAGE AMERICA LLC 197D SANTA FE NM
2018-12-03 510-902 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C FRNK MAIN CA
2018-12-03 510-954 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CA 649C HAYWARD CA
2018-12-03 573-516 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 FLAT RIVER MO
2018-12-03 669-259 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C SARATOGA CA

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.