Local Calling Area Database (LCAD)

The Local Calling Area Database (LCAD) can be used to quickly identify the jurisdictional relationship between any originating NPA NXX and terminating NPA NXX call combination. These relationships include determining whether the call is local, intraLATA, interLATA, intrastate, interstate, and for wireless to wireless or wireless to landline, whether the call is intraMTA or interMTA.

The LCAD contains local calling area information to identify the basic and expanded local calling areas for telephone exchanges in the United States and Canada based on incumbent wireline carriers' calling area definitions.

LCAD Local Cross Reference Table

NPA

NXX

BLOCK_ID

EXCHANGE

201

200

A

34125730

201

202

A

34125580

201

203

A

34125580

201

203

0

34125580

201

203

1

34125580

201

203

2

34125580

201

203

3

34125580

201

203

4

34125580

201

203

5

34125580

201

203

6

34125580

201

203

7

34125580

201

203

8

34125580

201

203

9

34125580

NPA - Numbering Plan Area (NPA) Code. An NPA, also known as a telephone area code, is the first three digits of a 10-digit North American Numbering Plan (NANP) telephone number in the form NXX-NXX-XXXX, where N represents any one of the numbers 2 through 9 and X represents any one of the numbers 0 through 9. Valid numeric range for NPA codes is 200 through 999.

NXX - Central Office Code (COC). The COC, commonly called the telephone exchange or prefix, is the second three digits (NXX) of a 10-digit NANP telephone number in the form NXX-NXX-XXXX, where N represents any one of the numbers 2 through 9 and X represents any one of the numbers 0 through 9. Valid numeric range for NXX codes is 200 through 999.

BLOCK_ID - Block identifier. Implies, represents, or identifies either the entire group of 10,000 numbers or a specific group of 1,000 numbers within the NPA NXX. An “A” record will be present for NPA NXX records that are “assigned” to the Code Holder per the Central Office Code Assignment Guidelines. For non-pooled numbers it identifies a 10,000-block level record and implies line assignments 0000 through 9999. For pooled numbers the “A” record is present for default routing purposes and identifies the LERG Assignee, numeric blocks must be referenced for actual carrier assignments. A numeric block (digits “0” through “9”) refers to those assignments made per Thousands Block Pooling Administrative Guidelines, it identifies a 1,000-block level record and refers to line assignments x000 through x999 where x=the block identifier.

EXCHANGE - Unique exchange index used to identify the NPA-NXX-BLOCK_ID combination.

 

LCAD Local Table

ORC_EXCHANGE

ORC_STATE

ORC_ABBR

ORC_LATA

ORC_MTA

TRC_EXCHANGE

TRC_STATE

TRC_ABBR

TRC_LATA

TRC_MTA

OCN

CALL_TYPE

RATE_STEP

34124850

NJ

ALLENTOWN

222

1

34124850

NJ

ALLENTOWN

222

1

9206

LCA

1

34124850

NJ

ALLENTOWN

222

1

34125670

NJ

HIGHTSTOWN

222

9