NumberResearch Membership · Data 09/27/2026

Recent prefix assignments

334 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/27/2026

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 26
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 22
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
2020-09-17 779-299 0XXX1XXX2XXX · 3 holders which blocks → STRATUS NETWORKS 495J WENONA IL
2020-09-17 779-304 1XXX3XXX · 2 holders which blocks → STRATUS NETWORKS 495J RUTLAND IL
2020-09-17 779-305 1XXX3XXX5XXX7XXX · 3 holders which blocks → STRATUS NETWORKS 495J REDDICK IL
2020-09-17 779-306 0–9 XXXall 10 · 6 holders which blocks → STRATUS NETWORKS 495J PONTIAC IL
2020-09-17 779-307 0XXX1XXX2XXX3XXX4XXX · 4 holders which blocks → STRATUS NETWORKS 495J LOSTANT IL
2020-09-17 779-308 0XXX1XXX3XXX · 3 holders which blocks → STRATUS NETWORKS 495J CHATSWORTH IL
2020-09-17 779-310 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → STRATUS NETWORKS 495J NEWMILFORD IL
2020-09-17 779-313 1XXX3XXX8XXX · 3 holders which blocks → STRATUS NETWORKS 495J CHERRY VLY IL
2020-09-17 779-314 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 2 holders which blocks → STRATUS NETWORKS 495J ROCK CUT IL
2020-09-17 779-315 0–9 XXXall 10 · 4 holders which blocks → STRATUS NETWORKS 495J ROSCOE IL
2020-09-17 779-316 0XXX1XXX3XXX6XXX8XXX · 4 holders which blocks → STRATUS NETWORKS 495J CRESTON IL
2020-09-17 779-317 1XXX2XXX3XXX8XXX · 3 holders which blocks → STRATUS NETWORKS 495J KIRKLAND IL
2020-09-17 779-318 1XXX3XXX7XXX · 3 holders which blocks → STRATUS NETWORKS 495J MALTA IL
2020-09-17 779-319 0XXX1XXX2XXX3XXX · 4 holders which blocks → STRATUS NETWORKS 495J MAPLE PARK IL
2020-09-17 779-320 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → STRATUS NETWORKS 495J MONROE CTR IL
2020-09-17 779-321 0XXX1XXX2XXX3XXX4XXX · 3 holders which blocks → STRATUS NETWORKS 495J SHABBONA IL
2020-09-17 779-322 1XXX2XXX3XXX · 3 holders which blocks → STRATUS NETWORKS 495J THOMAS IL
2020-09-17 820-234 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H OXNARD CA
2020-09-17 850-938 0–9 XXXall 10 · 4 holders which blocks → IP HORIZON LLC 515J TALLAHASSE FL
2020-09-17 858-758 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H EL CAJON CA
2020-09-17 858-833 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H SNDG SNDG CA
2020-09-17 858-955 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H PINEVALLEY CA
2020-09-17 872-273 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D CHICGOZN03 IL
2020-09-17 873-486 not yet reported which blocks → TELUS Quebec 2243 St-Pierre-de-Wakefield —
2020-09-17 925-466 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H CONCORD CA
2020-09-17 925-533 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H LIVERMORE CA
2020-09-17 947-957 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLCV - MI 543C PONTIAC MI
2020-09-17 949-669 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H CAPITRNVLY CA
2020-09-17 949-696 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H SADLBK VLY CA
2020-09-17 949-889 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H IRVINE CA
2020-09-17 949-996 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H NEWPORTBCH CA
2020-09-17 951-844 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H IDYLLWILD CA
2020-09-17 971-384 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J BEAVERTON OR
2020-09-16 262-362 0–9 XXXall 10 · 6 holders which blocks → TWILIO INTERNATIONAL, INC. 506J MILWAUKZN2 WI
2020-09-16 270-332 0XXX1XXX2XXX3XXX4XXX5XXX6XXX · 3 holders which blocks → WEST KENTUCKY RURAL TELEPHONE COOPERATIVE CORPORAT 584J MADISONVL KY
2020-09-16 341-400 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H OKLD FRTVL CA
2020-09-16 341-529 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H FRNK MAIN CA
2020-09-16 386-286 0–9 XXXall 10 · 3 holders which blocks → IP HORIZON LLC 515J DAYTONABCH FL
2020-09-16 412-769 0–9 XXXall 10 · 3 holders which blocks → IP HORIZON LLC 515J PTTSBGZON2 PA
2020-09-16 423-660 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TWILIO INTERNATIONAL, INC. 506J CHATTNOOGA TN
2020-09-16 430-278 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TEXARKANA TX
2020-09-16 431-306 not yet reported which blocks → Iristel Inc. 154E Portage La Prairie —
2020-09-16 431-446 not yet reported which blocks → Iristel Inc. 154E Winnipeg —
2020-09-16 445-895 0–9 XXXall 10 · 3 holders which blocks → TWILIO INTERNATIONAL, INC. 506J PHLDLPHZN1 PA
2020-09-16 458-253 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J ALBANY OR
2020-09-16 470-895 0–9 XXXall 10 · 2 holders which blocks → TWILIO INTERNATIONAL, INC. 506J ATLANTA GA
2020-09-16 480-714 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2020-09-16 509-403 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2020-09-16 520-486 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2020-09-16 561-539 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL 6502 BOCA RATON FL

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/27/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.