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

SLOAN prefixes in area code 712

NANPA records 3 assigned NXX blocks to rate center SLOAN in area code 712, 0.5% of the 633 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 NORTHWEST IOWA TELEPHONE, LLC (2), IMON COMMUNICATIONS LLC (1). The earliest assignment on record here is 2001-02-20 and the most recent 2006-07-28. 1 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 712
2 holders of record
1 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
712-421 NORTHWEST IOWA TELEPHONE, LLC 2001-02-20 no yes
712-428 NORTHWEST IOWA TELEPHONE, LLC – no yes
712-429 IMON COMMUNICATIONS LLC 2006-07-28 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
NORTHWEST IOWA TELEPHONE, LLC – 2 66.7%
IMON COMMUNICATIONS LLC – 1 33.3%

Frequently asked

Which prefixes belong to SLOAN in area code 712?

3 blocks: 421, 428, 429. The table above gives the holder of each.

Which carriers have numbers in SLOAN?

NORTHWEST IOWA TELEPHONE, LLC (2 blocks), IMON COMMUNICATIONS LLC (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is SLOAN 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 712

All 633 prefixes in 712