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  2. List of file signatures - Wikipedia

    en.wikipedia.org/wiki/List_of_file_signatures

    compressed file (often tar zip) using Lempel-Ziv-Welch algorithm 1F A0 ␟⍽ 0 z tar.z Compressed file (often tar zip) using LZH algorithm 2D 68 6C 30 2D-lh0-2 lzh Lempel Ziv Huffman archive file Method 0 (No compression) 2D 68 6C 35 2D-lh5-2 lzh Lempel Ziv Huffman archive file Method 5 (8 KiB sliding window) 42 41 43 4B 4D 49 4B 45 44 49 53 ...

  3. Address verification service - Wikipedia

    en.wikipedia.org/wiki/Address_verification_service

    An address verification service (AVS) is a service provided by major credit card processors to enable merchants to authenticate ownership of a credit or debit card used by a customer. [1] AVS is done as part of the merchant's request for authorization in a non-face-to-face credit card transaction. The credit card company or issuing bank ...

  4. Payment card number - Wikipedia

    en.wikipedia.org/wiki/Payment_card_number

    Payment card numbers are composed of 8 to 19 digits, [1] The leading six or eight digits are the issuer identification number (IIN) sometimes referred to as the bank identification number (BIN). [2]: 33 [3] The remaining numbers, except the last digit, are the individual account identification number. The last digit is the Luhn check digit.

  5. What Is a Billing Zip Code? How To Find Yours for Your ... - AOL

    www.aol.com/finance/billing-zip-code-yours...

    Beverly Hills, California 90210. Your billing zip code, or credit card postal code, is the five-digit number on the bottom right, which in this sample is 90210. This would be the zip code ...

  6. Postal address verification - Wikipedia

    en.wikipedia.org/wiki/Postal_address_verification

    If the address is valid, it is assigned a ZIP+4 code something like this: 12344-5678, where the first five digits are the ZIP code and the trailing four digits are the delivery range. An address with a ZIP+4 code (or nine-digit ZIP code) is considered to be valid. In most cases, this means that the address is deliverable.

  7. Cyclic redundancy check - Wikipedia

    en.wikipedia.org/wiki/Cyclic_redundancy_check

    A cyclic redundancy check (CRC) is an error-detecting code commonly used in digital networks and storage devices to detect accidental changes to digital data. [1][2] Blocks of data entering these systems get a short check value attached, based on the remainder of a polynomial division of their contents. On retrieval, the calculation is repeated ...

  8. Post office box - Wikipedia

    en.wikipedia.org/wiki/Post_office_box

    Nationally, the first five digits of the ZIP Code may or may not be the same as the P.O. Box address, and the last four digits (Zip + 4) are virtually always different. Except for a few of the largest post offices in the U.S., the 'Street Addressing' (not the P.O. Box address) nine digit Zip + 4 is the same for all boxes at a given location.

  9. Carding (fraud) - Wikipedia

    en.wikipedia.org/wiki/Carding_(fraud)

    On the more sophisticated of such sites, individual "dumps" may be purchased by zip code and country so as to avoid alerting banks about their misuse. [16] Automatic checker services perform validation en masse in order to quickly check if a card has yet to be blocked. Sellers will advertise their dump's "valid rate", based on estimates or ...