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

WKISSIMMEE prefixes in area code 321

NANPA records 3 assigned NXX blocks to rate center WKISSIMMEE in area code 321, 0.6% of the 502 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. 3 holders hold those blocks, the largest being MCI WORLDCOM COMMUNICATIONS, INC. - FL (1), PAETEC ITEL, LLC (1), CENTURYLINK OF FLORIDA, INC. (UNITED) (1). 3 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots. The same rate center name also appears in area codes 407, 689 – overlay codes cover the same geography, so a rate center is served by all of them.

3 assigned blocks – 0.6% of 321
3 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
321-286 MCI WORLDCOM COMMUNICATIONS, INC. - FL – yes yes
321-401 Windstream PAETEC ITEL, LLC – yes yes
321-677 Lumen CENTURYLINK OF FLORIDA, INC. (UNITED) – 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
MCI WORLDCOM COMMUNICATIONS, INC. - FL – 1 33.3%
PAETEC ITEL, LLC Windstream 1 33.3%
CENTURYLINK OF FLORIDA, INC. (UNITED) Lumen 1 33.3%

Same rate center in other codes

Overlay codes cover the same geography, so one rate center is served by all of them.

Frequently asked

Which prefixes belong to WKISSIMMEE in area code 321?

3 blocks: 286, 401, 677. The table above gives the holder of each.

Which carriers have numbers in WKISSIMMEE?

MCI WORLDCOM COMMUNICATIONS, INC. - FL (1 block), PAETEC ITEL, LLC (1 block), CENTURYLINK OF FLORIDA, INC. (UNITED) (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is WKISSIMMEE 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 321

All 502 prefixes in 321