NumberResearch Membership · Data 09/23/2026

Recent prefix assignments

338 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/23/2026

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. 39
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - IL 27
NEW CINGULAR WIRELESS PCS, LLC - DC 26
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
2011-10-06 575-342 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - NM 206F SILVERCITY NM
2011-10-06 631-562 0–9 XXXall 10 · 6 holders which blocks → CSC VOICE, LLC 612K PATCHOGUE NY
2011-10-06 631-573 0–9 XXXall 10 · 6 holders which blocks → CSC VOICE, LLC 612K SAYVILLE NY
2011-10-06 682-208 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ARLINGTON TX
2011-10-06 763-203 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TWINCITIES MN
2011-10-06 862-213 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 BLOOMFIELD NJ
2011-10-06 919-813 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 DURHAM NC
2011-10-06 919-908 0–9 XXXall 10 · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K DURHAM NC
2011-10-05 202-440 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - DC 6402 WSHNGTNZN1 DC
2011-10-05 209-255 0–9 XXXall 10 · 4 holders which blocks → WIDE VOICE, LLC - CA 252F RIPON CA
2011-10-05 320-206 0XXX7XXX · 2 holders which blocks → MIDCONTINENT COMMUNICATIONS - MN 429A RICHMOND MN
2011-10-05 512-319 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 AUSTIN TX
2011-10-05 651-202 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TWINCITIES MN
2011-10-05 832-502 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 SPRING TX
2011-10-04 206-538 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J SEATTLE WA
2011-10-04 226-773 not yet reported which blocks → Iristel Inc. 154E Windsor —
2011-10-04 240-203 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HAGERSTOWN MD
2011-10-04 240-234 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN2 MD
2011-10-04 240-458 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WALDORF MD
2011-10-04 240-470 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL236 MD
2011-10-04 240-504 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2011-10-04 289-819 not yet reported which blocks → Iristel Inc. 154E Richmond Hill —
2011-10-04 301-267 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2011-10-04 301-844 0–9 XXXall 10 · 8 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2011-10-04 318-206 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 ALEXANDRIA LA
2011-10-04 360-994 0–9 XXXall 10 · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 POULSBO WA
2011-10-04 401-209 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - RI 6389 PROVIDENCE RI
2011-10-04 438-933 not yet reported which blocks → TELUS Mobility 8303 Montreal —
2011-10-04 470-212 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - GA 8392 ATLANTA NE GA
2011-10-04 539-573 0–9 XXXall 10 · 3 holders which blocks → SOUTHWESTERN BELL 9533 TULSA OK
2011-10-04 581-703 not yet reported which blocks → Iristel Inc. 154E Quebec —
2011-10-04 623-282 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
2011-10-04 647-667 not yet reported which blocks → Videotron Ltd. 383F Toronto —
2011-10-04 647-766 not yet reported which blocks → TELUS Mobility 8303 Toronto —
2011-10-04 647-907 not yet reported which blocks → Videotron Ltd. 383F Toronto —
2011-10-04 708-666 0–9 XXXall 10 · 6 holders which blocks → CLEAR RATE COMMUNICATIONS, LLC 046L OAK PARK IL
2011-10-04 720-414 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CO 6118 ALLNSPKLYN CO
2011-10-04 807-619 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 Thunder Bay —
2011-10-03 207-248 0–9 XXXall 10 · 6 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 AUGUSTA ME
2011-10-03 314-296 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 ST LOUIS MO
2011-10-03 406-302 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MT 453F WOLF CREEK MT
2011-10-03 406-812 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - MT 453F LAUREL MT
2011-10-03 406-905 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MT 453F JOLIET MT
2011-10-03 458-200 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 CASCADELKS OR
2011-10-03 541-200 0–9 XXXall 10 · 7 holders which blocks → HUNTER CONSTRUCTION, INC. DBA HUNTER COMMS - OR 660C MEDFORD OR
2011-10-03 708-340 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 LA GRANGE IL
2011-10-03 857-213 0–9 XXXwhole prefix which blocks → PAETEC ITEL, LLC 829J BOSTON MA
2011-09-30 410-220 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 ELKRIDGE MD
2011-09-30 410-844 0–9 XXXall 10 · 2 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G BALTIMORE MD
2011-09-30 443-210 0–9 XXXall 10 · 6 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 SALISBURY MD

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/23/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.