NumberResearch Membership · Data 09/25/2026

Recent prefix assignments

358 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/25/2026

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 31
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - IL 27
ONVOY, LLC - NJ 15
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
2021-12-30 618-815 0XXX2XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J E ST LOUIS IL
2021-12-30 618-817 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 BELLEVILLE IL
2021-12-30 681-407 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LOGAN WV
2021-12-30 682-370 0XXX1XXX2XXX8XXX9XXX · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J RENO TX
2021-12-30 712-406 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J COUNCILBLF IA
2021-12-30 737-587 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H AUSTIN TX
2021-12-30 816-530 0XXX1XXX2XXX5XXX8XXX9XXX · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J SMITHVILLE MO
2021-12-30 862-882 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 PASSAIC NJ
2021-12-30 970-902 0–9 XXXall 10 · 7 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J GRAND JCT CO
2021-12-30 971-422 0XXX1XXX2XXX4XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - OR 076F VERNONIA OR
2021-12-29 228-279 0–9 XXXall 10 · 5 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J GULFPORT MS
2021-12-29 229-593 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 CUTHBERT GA
2021-12-29 234-343 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J MEDINA OH
2021-12-29 319-410 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → AUREON COMMUNICATIONS, LLC 444G OELWEIN IA
2021-12-29 331-280 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DOWNERSGRV IL
2021-12-29 332-263 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC- NY 384C NWYRCYZN01 NY
2021-12-29 332-388 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 NWYRCYZN01 NY
2021-12-29 346-537 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J HOUSTON TX
2021-12-29 361-285 0–9 XXXall 10 · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J C CHRISTI TX
2021-12-29 380-242 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - OH 464C COLUMBUS OH
2021-12-29 413-468 0XXX1XXX2XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 AMHERST MA
2021-12-29 413-469 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 AMHRSTFKLN MA
2021-12-29 423-749 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 COLLEGEDL TN
2021-12-29 434-323 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 SO BOSTON VA
2021-12-29 458-263 0XXX1XXX2XXX3XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - OR 076F SILVERLAKE OR
2021-12-29 504-396 0–9 XXXall 10 · 6 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J NEWORLEANS LA
2021-12-29 507-810 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MN 5816 MANKATO MN
2021-12-29 515-904 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J DES MOINES IA
2021-12-29 531-495 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J OMAHA NE
2021-12-29 563-346 0–9 XXXall 10 · 7 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J DAVENPORT IA
2021-12-29 582-220 0–9 XXXall 10 · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J STATECOLLG PA
2021-12-29 582-867 0XXX1XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → COMMIO, LLC 939H ERIE PA
2021-12-29 659-215 0–9 XXXall 10 · 6 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J TUSCALOOSA AL
2021-12-29 726-217 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J SANANTONIO TX
2021-12-29 737-313 0–9 XXXall 10 · 6 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J AUSTIN TX
2021-12-29 769-279 0–9 XXXall 10 · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J JACKSON MS
2021-12-29 779-341 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JOLIET IL
2021-12-29 804-701 0–9 XXXall 10 · 5 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J CHESTER VA
2021-12-29 865-427 0–9 XXXall 10 · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J KNOXVILLE TN
2021-12-29 913-418 0XXX2XXX3XXX6XXX8XXX9XXX · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 LOUISBURG KS
2021-12-29 940-334 0–9 XXXall 10 · 5 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J DENTON TX
2021-12-29 956-669 0XXX1XXX7XXX9XXX · 2 holders which blocks → PEERLESS NETWORK OF TEXAS, LLC - TX 177F HARLINGEN TX
2021-12-29 980-577 0–9 XXXall 10 · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J BESSEMERCY NC
2021-12-28 218-613 9XXX which blocks → BOOST SUBSCRIBERCO L.L.C. 490J DULUTH MN
2021-12-28 240-896 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J HAGERSTOWN MD
2021-12-28 240-902 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TWILIO INTERNATIONAL, INC. 506J DAMASCS240 MD
2021-12-28 256-953 0–9 XXXall 10 · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J HUNTSVILLE AL
2021-12-28 260-895 8XXX which blocks → TWILIO INTERNATIONAL, INC. 506J HAMILTON IN
2021-12-28 302-589 0–9 XXXall 10 · 6 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J LAUREL DE
2021-12-28 386-895 0–9 XXXall 10 · 4 holders which blocks → TWILIO INTERNATIONAL, INC. 506J NWSMYRNBCH FL

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.