--- title: "BIP39 Word #287: cat — Seed Phrase Mnemonic Word" url: "https://bip39-phrase.com/bip39-word/cat/" language: "en" updated: "2026-10-19T00:00:00+00:00" --- Word #287 00100011110 # cat — BIP39 word #287 "**cat**" is word #287 of the 2048 words in the official BIP39 English wordlist, between [casual](/bip39-word/casual/) and [catalog](/bip39-word/catalog/). In a seed phrase it stands for the 11-bit value `00100011110`, decimal index 286\. /kæt/ · _noun:_ a small furry animal with whiskers, often kept as a pet [Russian](/ru/ "The BIP39 wordlist with Russian translations"): кошка ## 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): [phrase](/bip39-word/phrase/)[glow](/bip39-word/glow/)[adult](/bip39-word/adult/)[critic](/bip39-word/critic/)[cloth](/bip39-word/cloth/)[chief](/bip39-word/chief/)[canyon](/bip39-word/canyon/)[carpet](/bip39-word/carpet/)[cash](/bip39-word/cash/)[castle](/bip39-word/castle/)[catalog](/bip39-word/catalog/) Position Hex Index 0x11E 4-Letter Prefix cat ## About "cat" in BIP39 - All three letters of "cat" also begin longer words: [catalog](/bip39-word/catalog/), [catch](/bip39-word/catch/), [category](/bip39-word/category/) and [cattle](/bip39-word/cattle/). So "cat" cannot be shortened, and a backup that keeps the first four letters of each word stores it as **"cat"** but catalog as **"cata"**. - "cat" appears in one of the 24 official English [test vectors](https://github.com/trezor/python-mnemonic/blob/master/vectors.json) of BIP39: vector #19 (word 1 of 12). 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 #19 cat [swing](/bip39-word/swing/) [flag](/bip39-word/flag/) [economy](/bip39-word/economy/) [stadium](/bip39-word/stadium/) [alone](/bip39-word/alone/) [churn](/bip39-word/churn/) [speed](/bip39-word/speed/) [unique](/bip39-word/unique/) [patch](/bip39-word/patch/) [report](/bip39-word/report/) [train](/bip39-word/train/) ## Word #287 in the Other 9 BIP39 Wordlists [Czech](/czech/) drak [French](/french/) brochure [Italian](/italian/) calmo [Japanese](/japanese/) おたく [Korean](/korean/) 나들이 [Portuguese](/portuguese/) bifocal [Spanish](/spanish/) bucle [Traditional Chinese](/chinese-traditional/) 濟 [Simplified Chinese](/chinese-simplified/) 济 ## Similar Words — Check Carefully During Recovery 6 BIP39 words differ from "cat" by just a single letter — the most common source of typos when a seed phrase is entered by hand: [can](/bip39-word/can/)[car](/bip39-word/car/)[cart](/bip39-word/cart/)[chat](/bip39-word/chat/)[fat](/bip39-word/fat/)[hat](/bip39-word/hat/) Swap two neighbouring letters and "cat" becomes [act](/bip39-word/act/), another valid word that is easy to miss when copying a phrase. Read aloud, "cat" /kæt/ is one sound away from these 7 words: [cash /kæʃ/](/bip39-word/cash/)[catch /kæʧ/](/bip39-word/catch/)[cattle /ˈkætl/](/bip39-word/cattle/)[caught /kɔːt/](/bip39-word/caught/)[kit /kɪt/](/bip39-word/kit/)[kite /kaɪt/](/bip39-word/kite/)[that /ðæt/](/bip39-word/that/) Words sharing the first three letters "cat": [catalog](/bip39-word/catalog/)[catch](/bip39-word/catch/)[category](/bip39-word/category/)[cattle](/bip39-word/cattle/) ## More BIP39 Words Starting with "C" [ #283 cash ](/bip39-word/cash/)[ #284 casino ](/bip39-word/casino/)[ #285 castle ](/bip39-word/castle/)[ #286 casual ](/bip39-word/casual/)[ #288 catalog ](/bip39-word/catalog/)[ #289 catch ](/bip39-word/catch/)[ #290 category ](/bip39-word/category/)[ #291 cattle ](/bip39-word/cattle/) [View all words starting with "C" ](/bip39-words/c/) ## Seed phrase, key and recovery guides - [Electrum Seed vs BIP39: Why Other Wallets Reject It](/electrum-seed-vs-bip39/) - [Cold Sharding: Splitting a Private Key Into Offline Shamir Shares](/cold-sharding-method-private-key-storage-strategy/) - [Test Your Wallet Backup: A Self-Audit of Your Seed Phrase](/hack-own-crypto-wallet/) [ Full BIP39 Wordlist ](/)