NumberingData
Verified Nov 1, 2026 · Source: NANPA CO Code Assignment Records

SCIENCE HL prefixes in area code 606

NANPA records 3 assigned NXX blocks to rate center SCIENCE HL in area code 606, 0.5% of the 639 blocks assigned in the code. A rate center is the billing geography a block is allocated to – NANPA truncates the name to ten characters, so read it as a NANPA label rather than a town. 2 holders hold those blocks, the largest being LEVEL 3 COMMUNICATIONS, LLC - KY (2), WINDSTREAM KENTUCKY EAST, INC. - LONDON (1). The earliest assignment on record here is 2002-06-19 and the most recent 2002-09-24. 2 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

3 assigned blocks – 0.5% of 606
2 holders of record
2 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
606-394 Lumen LEVEL 3 COMMUNICATIONS, LLC - KY 2002-06-19 yes yes
606-423 Windstream WINDSTREAM KENTUCKY EAST, INC. - LONDON – no yes
606-685 Lumen LEVEL 3 COMMUNICATIONS, LLC - KY 2002-09-24 yes yes

The holder is who received the block from the numbering administrator. It is not necessarily the carrier serving a given number: numbers move with their owners, and a pooled block is shared.

Who holds the blocks

HolderBrandBlocksShare here
LEVEL 3 COMMUNICATIONS, LLC - KY Lumen 2 66.7%
WINDSTREAM KENTUCKY EAST, INC. - LONDON Windstream 1 33.3%

Frequently asked

Which prefixes belong to SCIENCE HL in area code 606?

3 blocks: 394, 423, 685. The table above gives the holder of each.

Which carriers have numbers in SCIENCE HL?

LEVEL 3 COMMUNICATIONS, LLC - KY (2 blocks), WINDSTREAM KENTUCKY EAST, INC. - LONDON (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is SCIENCE HL a city?

It is a rate center – the unit NANPA allocates number blocks to. Its name is abbreviated to ten characters and is not necessarily a settlement: we print it as recorded rather than guess at the full name.

Other rate centers in 606

All 639 prefixes in 606