---
title: "BIP39 Word #1904: unknown — Seed Phrase Mnemonic Word"
url: "https://bip39-phrase.com/bip39-word/unknown/"
language: "en"
updated: "2026-10-19T00:00:00+00:00"
---

Word #1904 11101101111 

# unknown — BIP39 word #1904

"**unknown**" is word #1904 of the 2048 words in the official BIP39 English wordlist, between [universe](/bip39-word/universe/) and [unlock](/bip39-word/unlock/). In a seed phrase it stands for the 11-bit value `11101101111`, decimal index 1903\. 

/ʌnˈnəʊn/  · _adjective:_ not known, identified or familiar 

[Russian](/ru/ "The BIP39 wordlist with Russian translations"): неизвестный 

## Binary Representation

Nine 1-bits and two 0-bits; 55 of the 2048 indexes have exactly nine 1-bits.

One wrong bit turns it into (leftmost bit first):

[hospital](/bip39-word/hospital/)[pupil](/bip39-word/pupil/)[social](/bip39-word/social/)[worth](/bip39-word/worth/)[tourist](/bip39-word/tourist/)[try](/bip39-word/try/)[useful](/bip39-word/useful/)[undo](/bip39-word/undo/)[uniform](/bip39-word/uniform/)[unit](/bip39-word/unit/)[universe](/bip39-word/universe/) 

Position

Hex Index

0x76F

4-Letter Prefix

unkn

## About "unknown" in BIP39

- "unknown" has 7 letters, but the first three, **"unk"**, already identify it, because **"un"** also begins 17 other words, among them [unable](/bip39-word/unable/), [unaware](/bip39-word/unaware/), [uncle](/bip39-word/uncle/) and [uncover](/bip39-word/uncover/). Three letters are enough for only 604 of the 2048 words.

## Word #1904 in the Other 9 BIP39 Wordlists

[Czech](/czech/) vyrvat 

[French](/french/) toucher 

[Italian](/italian/) tuffato 

[Japanese](/japanese/) もくようび 

[Korean](/korean/) 학급 

[Portuguese](/portuguese/) torque 

[Spanish](/spanish/) trébol 

[Traditional Chinese](/chinese-traditional/) 煩 

[Simplified Chinese](/chinese-simplified/) 烦 

## More BIP39 Words Starting with "U"

[ #1900 uniform ](/bip39-word/uniform/)[ #1901 unique ](/bip39-word/unique/)[ #1902 unit ](/bip39-word/unit/)[ #1903 universe ](/bip39-word/universe/)[ #1905 unlock ](/bip39-word/unlock/)[ #1906 until ](/bip39-word/until/)[ #1907 unusual ](/bip39-word/unusual/)[ #1908 unveil ](/bip39-word/unveil/) 

[View all words starting with "U" ](/bip39-words/u/) 

## Seed phrase, key and recovery guides

- [Seed Phrase Examples: 12, 18 and 24 BIP39 Mnemonic Phrases](/mnemonic-words-examples-for-crypto-security-bip39/)
- [How to Protect Your Crypto Wallet from Phishing](/protect-crypto-wallet-from-phishing/)
- [Monero Seed Phrase: 25 Words, Polyseed and Private Keys](/seed-phrase-and-private-key-format-of-monero-guide/)

[ Full BIP39 Wordlist ](/)