NumberResearch Membership · Data 09/22/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/22/2026

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 484
RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 26
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
2019-06-03 484-710 1XXX2XXX3XXX4XXX9XXX · 4 holders which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 NEWSMITHVL PA
2010-11-17 484-387 0–9 XXXall 10 · 5 holders which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 ALLENTOWN PA
— 484-208 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 CHESTERSPG PA
— 484-281 0XXX1XXX2XXX7XXX · 4 holders which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 BATH PA
— 484-363 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 4 holders which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 POTTSTOWN PA
— 484-393 0XXX1XXX2XXX3XXX4XXX5XXX7XXX · 4 holders which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 PHPHSBZN29 PA
— 484-399 1XXX4XXX7XXX which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 PHPHSBZN29 PA
— 484-414 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 5 holders which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 PHPHSBZN24 PA
— 484-440 0XXX1XXX2XXX9XXX · 3 holders which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 PHPHSBZN12 PA
— 484-452 0XXX1XXX2XXX3XXX4XXX5XXX9XXX · 6 holders which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 PHPHSBZN21 PA
— 484-461 0XXX1XXX2XXX5XXX · 3 holders which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 PHPHSBZN17 PA
— 484-474 0XXX1XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 PHPHSBZN13 PA
— 484-478 1XXX2XXX3XXX4XXX which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 PHPHSBZN13 PA
— 484-485 0XXX1XXX2XXX3XXX7XXX9XXX · 3 holders which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 PHPHSBZN11 PA
— 484-487 1XXX2XXX3XXX7XXX · 4 holders which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 PHPHSBZN11 PA
— 484-494 1XXX2XXX7XXX · 2 holders which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 PHPHSBZN14 PA
— 484-535 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 3 holders which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 PHPHSBZN31 PA
— 484-584 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 6 holders which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 PHPHSBZN26 PA
— 484-651 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 3 holders which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 READING PA
— 484-681 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 5 holders which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 PHPHSBZN30 PA
— 484-696 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 5 holders which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 DOWNINGTN PA
— 484-733 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 2 holders which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 KENNETT SQ PA
— 484-844 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 PHPHSBZN10 PA
— 484-851 0XXX1XXX2XXX7XXX9XXX · 4 holders which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 HELLERTOWN PA
— 484-874 0XXX1XXX2XXX3XXX4XXX5XXX7XXX · 4 holders which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 EXTON PA
— 484-979 0XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → RCN TELECOM SERVICES OF PENNSYLVANIA, INC. 7615 COLLEGEVL PA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/22/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.