--- title: "BIP39 Word #440: dad — Seed Phrase Mnemonic Word" url: "https://bip39-phrase.com/bip39-word/dad/" language: "en" updated: "2026-10-19T00:00:00+00:00" --- Word #440 00110110111 # dad — BIP39 word #440 "**dad**" is word #440 of the 2048 words in the official BIP39 English wordlist, between [cycle](/bip39-word/cycle/) and [damage](/bip39-word/damage/). In a seed phrase it stands for the 11-bit value `00110110111`, decimal index 439\. /dæd/ · _noun:_ an informal word for father [Russian](/ru/ "The BIP39 wordlist with Russian translations"): папа ## Binary Representation Seven 1-bits and four 0-bits; 330 of the 2048 indexes have exactly seven 1-bits. One wrong bit turns it into (leftmost bit first): [report](/bip39-word/report/)[ivory](/bip39-word/ivory/)[black](/bip39-word/black/)[cheap](/bip39-word/cheap/)[discover](/bip39-word/discover/)[cream](/bip39-word/cream/)[crunch](/bip39-word/crunch/)[dawn](/bip39-word/dawn/)[cushion](/bip39-word/cushion/)[cute](/bip39-word/cute/)[cycle](/bip39-word/cycle/) Position Hex Index 0x1B7 4-Letter Prefix dad ## About "dad" in BIP39 - It takes all three letters to identify "dad": **"da"** also begins 9 other words, among them [damage](/bip39-word/damage/), [damp](/bip39-word/damp/), [dance](/bip39-word/dance/) and [danger](/bip39-word/danger/). Three letters are enough for only 604 of the 2048 words. ## Word #440 in the Other 9 BIP39 Wordlists [Czech](/czech/) horizont [French](/french/) congeler [Italian](/italian/) damerino [Japanese](/japanese/) きもだめし [Korean](/korean/) 마찬가지 [Portuguese](/portuguese/) chicote [Spanish](/spanish/) comer [Traditional Chinese](/chinese-traditional/) 值 [Simplified Chinese](/chinese-simplified/) 值 ## Similar Words — Check Carefully During Recovery 3 BIP39 words differ from "dad" by just a single letter — the most common source of typos when a seed phrase is entered by hand: [day](/bip39-word/day/)[mad](/bip39-word/mad/)[sad](/bip39-word/sad/) Swap two neighbouring letters and "dad" becomes [add](/bip39-word/add/), another valid word that is easy to miss when copying a phrase. Read aloud, "dad" /dæd/ is one sound away from these 2 words: [add /æd/](/bip39-word/add/)[dash /dæʃ/](/bip39-word/dash/) ## More BIP39 Words Starting with "D" [ #441 damage ](/bip39-word/damage/)[ #442 damp ](/bip39-word/damp/)[ #443 dance ](/bip39-word/dance/)[ #444 danger ](/bip39-word/danger/)[ #548 dutch ](/bip39-word/dutch/)[ #549 duty ](/bip39-word/duty/)[ #550 dwarf ](/bip39-word/dwarf/)[ #551 dynamic ](/bip39-word/dynamic/) [View all words starting with "D" ](/bip39-words/d/) ## Seed phrase, key and recovery guides - [BIP 157 Client-Side Block Filtering: Compact Filters Explained](/bip-157-client-side-block-filtering/) - [Bitcoin Core Seed Phrase: Why There Is None and How to Back Up](/bitcoin-core-seed-phrase-backup-guide/) - [BIP38 Encrypted Private Keys: 6P Format and How to Decrypt](/bip38/) [ Full BIP39 Wordlist ](/)