NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 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, all time — NPA 857
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 67
OMNIPOINT MIAMI E LICENSE, LLC 61
ONVOY, LLC - MA 42
METROPCS, INC. 25
PAETEC ITEL, LLC 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
2021-08-20 857-788 0–9 XXXall 10 · 4 holders which blocks → SKYE TELECOM LLC DBA SKYETEL 622J BOSTON MA
2021-07-28 857-379 0–9 XXXall 10 · 3 holders which blocks → COMMIO, LLC 939H ROXBURY MA
2021-07-16 857-384 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MA 892D BRIGHTON MA
2021-06-29 857-376 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 BROOKLINE MA
2021-06-14 857-374 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MA 892D QUINCY MA
2021-06-14 857-375 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MA 892D DORCHESTER MA
2021-06-14 857-382 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MA 892D EASTBOSTON MA
2021-06-14 857-392 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MA 892D JAMAICA PL MA
2021-06-14 857-422 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MA 892D SO BOSTON MA
2021-05-17 857-372 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 QUINCY MA
2021-04-27 857-758 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H BOSTON MA
2021-04-02 857-675 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MA 892D ROXBURY MA
2021-04-02 857-678 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MA 892D BELMONT MA
2021-04-01 857-475 0XXX1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - MA 892D CHELSEA MA
2021-04-01 857-575 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MA 892D SOMERVILLE MA
2021-04-01 857-597 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MA 892D WINTHROP MA
2021-03-26 857-370 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 BROOKLINE MA
2021-03-17 857-847 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H DORCHESTER MA
2021-03-17 857-867 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H BROOKLINE MA
2021-03-11 857-810 0–9 XXXwhole prefix which blocks → ONVOY, LLC - MA 892D BOSTON MA
2021-01-25 857-855 0–9 XXXwhole prefix which blocks → ONVOY, LLC - MA 892D BOSTON MA
2020-12-21 857-369 0–9 XXXwhole prefix which blocks → PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F BOSTON MA
2020-12-18 857-887 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H JAMAICA PL MA
2020-12-08 857-754 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MA 892D QUINCY MA
2020-10-09 857-578 0–9 XXXall 10 · 2 holders which blocks → TWILIO INTERNATIONAL, INC. 506J NEWTON MA
2020-10-05 857-367 0–9 XXXall 10 · 3 holders which blocks → TC SYSTEMS, INC. 7135 WATERTOWN MA
2020-09-29 857-340 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 BROOKLINE MA
2020-09-03 857-755 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H QUINCY MA
2020-08-19 857-281 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 QUINCY MA
2020-07-21 857-766 0XXX1XXX2XXX3XXX4XXX6XXX8XXX · 3 holders which blocks → FRACTEL, LLC 965H SO BOSTON MA
2020-05-29 857-365 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 478J BOSTON MA
2020-05-28 857-837 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → ONVOY, LLC - MA 892D CHARLESTN MA
2020-05-15 857-567 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX which blocks → ONVOY, LLC - MA 892D DORCHESTER MA
2020-05-13 857-380 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MA 892D EASTBOSTON MA
2020-05-13 857-858 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MA 892D NEWTON MA
2020-05-13 857-877 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MA 892D BRIGHTON MA
2020-05-08 857-465 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H BOSTON MA
2020-03-24 857-359 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 QUINCY MA
2020-03-23 857-358 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 QUINCY MA
2020-01-06 857-353 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BOSTON MA
2019-12-24 857-357 0–9 XXXall 10 · 5 holders which blocks → MEGAPHONE, INC. 007J CAMBRIDGE MA
2019-10-11 857-356 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 BOSTON MA
2019-10-07 857-355 0–9 XXXall 10 · 5 holders which blocks → AIRUS, INC. - MA 428H EVERETT MA
2019-09-12 857-423 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 BROOKLINE MA
2019-09-12 857-437 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 ROXBURY MA
2019-08-27 857-557 0–9 XXXall 10 · 4 holders which blocks → HD CARRIER LLC 321J BOSTON MA
2019-06-25 857-328 0–9 XXXall 10 · 3 holders which blocks → VOIP INNOVATIONS, LLC 597F BOSTON MA
2019-06-06 857-335 0–9 XXXall 10 · 5 holders which blocks → CSC WIRELESS, LLC 425J BOSTON MA
2019-02-07 857-341 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E BELMONT MA
2018-11-21 857-354 0–9 XXXall 10 · 7 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 BOSTON MA

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.