--- title: "BIP39 Word #399: crack — Seed Phrase Mnemonic Word" url: "https://bip39-phrase.com/bip39-word/crack/" language: "en" updated: "2026-10-19T00:00:00+00:00" --- Word #399 00110001110 # crack — BIP39 word #399 "**crack**" is word #399 of the 2048 words in the official BIP39 English wordlist, between [coyote](/bip39-word/coyote/) and [cradle](/bip39-word/cradle/). In a seed phrase it stands for the 11-bit value `00110001110`, decimal index 398\. /kræk/ · _noun:_ a narrow break or line on a surface that has split [Russian](/ru/ "The BIP39 wordlist with Russian translations"): трещина ## Binary Representation Five 1-bits and six 0-bits; 462 of the 2048 indexes have exactly five 1-bits. One wrong bit turns it into (leftmost bit first): [range](/bip39-word/range/)[impact](/bip39-word/impact/)[balcony](/bip39-word/balcony/)[canyon](/bip39-word/canyon/)[degree](/bip39-word/degree/)[cupboard](/bip39-word/cupboard/)[critic](/bip39-word/critic/)[cotton](/bip39-word/cotton/)[course](/bip39-word/course/)[cover](/bip39-word/cover/)[cradle](/bip39-word/cradle/) Position Hex Index 0x18E 4-Letter Prefix crac ## About "crack" in BIP39 - "crack" has 5 letters, but the first four, **"crac"**, already identify it, because **"cra"** also begins 8 other words, among them [cradle](/bip39-word/cradle/), [craft](/bip39-word/craft/), [cram](/bip39-word/cram/) and [crane](/bip39-word/crane/). - "crack" appears in two of the 24 official English [test vectors](https://github.com/trezor/python-mnemonic/blob/master/vectors.json) of BIP39: vectors #17 (word 17 of 18) and #20 (word 15 of 18). Every official vector passes the [checksum checker](/bip39-checksum-checker/), and [How BIP39 works](/how-bip39-works/) shows how the entropy turns into such words. Official test vector #17 [horn](/bip39-word/horn/) [tenant](/bip39-word/tenant/) [knee](/bip39-word/knee/) [talent](/bip39-word/talent/) [sponsor](/bip39-word/sponsor/) [spell](/bip39-word/spell/) [gate](/bip39-word/gate/) [clip](/bip39-word/clip/) [pulse](/bip39-word/pulse/) [soap](/bip39-word/soap/) [slush](/bip39-word/slush/) [warm](/bip39-word/warm/) [silver](/bip39-word/silver/) [nephew](/bip39-word/nephew/) [swap](/bip39-word/swap/) [uncle](/bip39-word/uncle/) crack [brave](/bip39-word/brave/) ## Word #399 in the Other 9 BIP39 Wordlists [Czech](/czech/) helma [French](/french/) cirer [Italian](/italian/) cordata [Japanese](/japanese/) きさま [Korean](/korean/) 대한민국 [Portuguese](/portuguese/) carpete [Spanish](/spanish/) cifra [Traditional Chinese](/chinese-traditional/) 連 [Simplified Chinese](/chinese-simplified/) 连 ## Similar Words — Check Carefully During Recovery 2 BIP39 words differ from "crack" by just a single letter — the most common source of typos when a seed phrase is entered by hand: [rack](/bip39-word/rack/)[track](/bip39-word/track/) Read aloud, "crack" /kræk/ is one sound away from these 3 words: [cram /kræm/](/bip39-word/cram/)[crash /kræʃ/](/bip39-word/crash/)[creek /kriːk/](/bip39-word/creek/) Words sharing the first three letters "cra": [cradle](/bip39-word/cradle/)[craft](/bip39-word/craft/)[cram](/bip39-word/cram/)[crane](/bip39-word/crane/)[crash](/bip39-word/crash/)[crater](/bip39-word/crater/)[crawl](/bip39-word/crawl/)[crazy](/bip39-word/crazy/) ## More BIP39 Words Starting with "C" [ #395 course ](/bip39-word/course/)[ #396 cousin ](/bip39-word/cousin/)[ #397 cover ](/bip39-word/cover/)[ #398 coyote ](/bip39-word/coyote/)[ #400 cradle ](/bip39-word/cradle/)[ #401 craft ](/bip39-word/craft/)[ #402 cram ](/bip39-word/cram/)[ #403 crane ](/bip39-word/crane/) [View all words starting with "C" ](/bip39-words/c/) ## Seed phrase, key and recovery guides - [Invalid Seed Phrase? How to Find and Fix a Wrong Word (BIP39)](/how-to-fix-seed-phrase-errors/) - [Ethereum Keystore File (JSON Wallet): Structure and Security](/json-wallets-explained/) - [What Is BIP39? The Standard Behind Seed Phrases](/bip39-the-foundation-of-crypto-wallet-security/) [ Full BIP39 Wordlist ](/)