NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

2 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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 — NPA 650
ONVOY, LLC - CA 2
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
2016-04-25 650-499 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E MT VIEW CA
2016-02-11 650-750 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C HALFMOONBY CA
2016-01-29 650-770 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CA 649C LOS ALTOS CA
2016-01-15 650-334 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 PALO ALTO CA
2015-12-01 650-203 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E MT VIEW CA
2015-10-23 650-457 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SSNFRNCSCO CA
2015-09-11 650-431 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SAN MATEO CA
2015-09-08 650-436 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SAN MATEO CA
2015-09-04 650-441 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PALO ALTO CA
2015-08-31 650-546 0–9 XXXall 10 · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 PALO ALTO CA
2015-08-26 650-495 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 MT VIEW CA
2015-03-25 650-822 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - CA 649C SSNFRNCSCO CA
2015-03-13 650-660 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 HALFMOONBY CA
2015-02-16 650-435 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SAN MATEO CA
2015-01-20 650-695 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E MT VIEW CA
2014-11-03 650-338 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 HALFMOONBY CA
2014-10-27 650-797 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SSNFRNCSCO CA
2014-10-17 650-460 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PALO ALTO CA
2014-10-16 650-382 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 PALO ALTO CA
2014-10-13 650-785 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PALO ALTO CA
2014-09-30 650-772 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 MT VIEW CA
2014-09-24 650-753 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SAN MATEO CA
2014-09-03 650-667 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SAN MATEO CA
2014-07-21 650-665 0–9 XXXall 10 · 8 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PALO ALTO CA
2014-06-03 650-727 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SAN MATEO CA
2014-04-07 650-656 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PALO ALTO CA
2014-03-03 650-437 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SAN MATEO CA
2013-10-21 650-285 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E PALO ALTO CA
2013-08-19 650-272 0–9 XXXall 10 · 8 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PALO ALTO CA
2013-07-22 650-445 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 SAN MATEO CA
2013-04-19 650-422 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PALO ALTO CA
2012-04-13 650-252 0–9 XXXwhole prefix which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F PALO ALTO CA
2011-09-13 650-258 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 PALO ALTO CA
2010-12-23 650-308 0–9 XXXall 10 · 5 holders which blocks → PACIFIC BELL 9740 PALO ALTO CA
2009-12-14 650-673 0–9 XXXall 10 · 3 holders which blocks → AT&T ENTERPRISES, LLC 516C LA HONDA CA
2008-10-04 650-597 0–9 XXXall 10 · 5 holders which blocks → UTILITY TELECOM GROUP, LLC - CA 9262 SNCRL-BLMT CA
2007-02-15 650-214 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 MT VIEW CA
2006-12-27 650-427 0–9 XXXall 10 · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 PALO ALTO CA
2005-08-04 650-521 0–9 XXXall 10 · 4 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L PALO ALTO CA
2005-03-07 650-676 0–9 XXXall 10 · 4 holders which blocks → UTILITY TELECOM GROUP, LLC - CA 9262 SSNFRNCSCO CA
2004-04-27 650-253 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 MT VIEW CA
2003-08-15 650-942 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MILLBRAE CA
2002-09-19 650-305 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 LOS ALTOS CA
2002-09-19 650-440 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 HALFMOONBY CA
2002-09-19 650-861 3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 MT VIEW CA
2002-08-21 650-804 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PALO ALTO CA
2002-01-28 650-450 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MT VIEW CA
2002-01-28 650-454 1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 REDWOOD CY CA
2002-01-28 650-490 1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MILLBRAE CA
2002-01-28 650-492 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LOS ALTOS CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.