--- title: "BIP39 Word #1238: one — Seed Phrase Mnemonic Word" url: "https://bip39-phrase.com/bip39-word/one/" language: "en" updated: "2026-10-19T00:00:00+00:00" --- Word #1238 10011010101 # one — BIP39 word #1238 "**one**" is word #1238 of the 2048 words in the official BIP39 English wordlist, between [once](/bip39-word/once/) and [onion](/bip39-word/onion/). In a seed phrase it stands for the 11-bit value `10011010101`, decimal index 1237\. /wʌn/ · _number:_ the smallest positive whole number, representing a single thing [Russian](/ru/ "The BIP39 wordlist with Russian translations"): один ## Binary Representation Six 1-bits and five 0-bits; 462 of the 2048 indexes have exactly six 1-bits. One wrong bit turns it into (leftmost bit first): [boy](/bip39-word/boy/)[survey](/bip39-word/survey/)[rival](/bip39-word/rival/)[melt](/bip39-word/melt/)[naive](/bip39-word/naive/)[pact](/bip39-word/pact/)[obvious](/bip39-word/obvious/)[option](/bip39-word/option/)[olive](/bip39-word/olive/)[online](/bip39-word/online/)[once](/bip39-word/once/) Position Hex Index 0x4D5 4-Letter Prefix one ## About "one" in BIP39 - It takes all three letters to identify "one": **"on"** also begins [once](/bip39-word/once/), [onion](/bip39-word/onion/), [online](/bip39-word/online/) and [only](/bip39-word/only/). Three letters are enough for only 604 of the 2048 words. ## Word #1238 in the Other 9 BIP39 Wordlists [Czech](/czech/) plyn [French](/french/) métal [Italian](/italian/) patacca [Japanese](/japanese/) つのる [Korean](/korean/) 외출 [Portuguese](/portuguese/) massagem [Spanish](/spanish/) nieto [Traditional Chinese](/chinese-traditional/) 彪 [Simplified Chinese](/chinese-simplified/) 彪 ## Similar Words — Check Carefully During Recovery 4 BIP39 words differ from "one" by just a single letter — the most common source of typos when a seed phrase is entered by hand: [bone](/bip39-word/bone/)[once](/bip39-word/once/)[tone](/bip39-word/tone/)[zone](/bip39-word/zone/) Read aloud, "one" /wʌn/ is one sound away from these 7 words: [fun /fʌn/](/bip39-word/fun/)[gun /gʌn/](/bip39-word/gun/)[run /rʌn/](/bip39-word/run/)[sun /sʌn/](/bip39-word/sun/)[when /wɛn/](/bip39-word/when/)[win /wɪn/](/bip39-word/win/)[wine /waɪn/](/bip39-word/wine/) ## More BIP39 Words Starting with "O" [ #1234 olive ](/bip39-word/olive/)[ #1235 olympic ](/bip39-word/olympic/)[ #1236 omit ](/bip39-word/omit/)[ #1237 once ](/bip39-word/once/)[ #1239 onion ](/bip39-word/onion/)[ #1240 online ](/bip39-word/online/)[ #1241 only ](/bip39-word/only/)[ #1242 open ](/bip39-word/open/) [View all words starting with "O" ](/bip39-words/o/) ## Seed phrase, key and recovery guides - [SLIP-39 vs BIP39: Shamir Backup and 20-Word Shares Explained](/slip39-vs-bip39/) - [Why You Should Never Create Your Own Seed Phrase](/why-you-should-never-create-your-own-seed-phrase/) - [12 vs 24 Word Seed Phrase: Which Is More Secure?](/12-vs-24-word-seed-phrase/) [ Full BIP39 Wordlist ](/)