---
title: "BIP39 Word #1920: useful — Seed Phrase Mnemonic Word"
url: "https://bip39-phrase.com/bip39-word/useful/"
language: "en"
updated: "2026-10-19T00:00:00+00:00"
---

Word #1920 11101111111 

# useful — BIP39 word #1920

"**useful**" is word #1920 of the 2048 words in the official BIP39 English wordlist, between [used](/bip39-word/used/) and [useless](/bip39-word/useless/). In a seed phrase it stands for the 11-bit value `11101111111`, decimal index 1919\. 

/ˈjuːsfʊl/  · _adjective:_ able to help you do or achieve something 

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

## Binary Representation

A single 0-bit, which only ten other indexes share: [lend](/bip39-word/lend/), [say](/bip39-word/say/), [that](/bip39-word/that/), [wave](/bip39-word/wave/), [winner](/bip39-word/winner/), [worth](/bip39-word/worth/), [year](/bip39-word/year/), [youth](/bip39-word/youth/), [zero](/bip39-word/zero/) and [zone](/bip39-word/zone/).

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

[husband](/bip39-word/husband/)[quiz](/bip39-word/quiz/)[soup](/bip39-word/soup/)[zoo](/bip39-word/zoo/)[tree](/bip39-word/tree/)[typical](/bip39-word/typical/)[unknown](/bip39-word/unknown/)[upon](/bip39-word/upon/)[urge](/bip39-word/urge/)[use](/bip39-word/use/)[used](/bip39-word/used/) 

Position

Hex Index

0x77F

4-Letter Prefix

usef

## About "useful" in BIP39

- "useful" has 6 letters, but the first four, **"usef"**, already identify it, because **"use"** also begins [use](/bip39-word/use/), [used](/bip39-word/used/) and [useless](/bip39-word/useless/).
- Its first letters also spell another BIP39 word, [use](/bip39-word/use/). Write "useful" out in full: cut short, it turns into a different valid word.
- "useful" appears in three of the 24 official English [test vectors](https://github.com/trezor/python-mnemonic/blob/master/vectors.json) of BIP39: vectors #2 (word 8 of 12), #6 (words 8 and 16 of 18) and #10 (words 8 and 16 of 24). 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 #2

[legal](/bip39-word/legal/) [winner](/bip39-word/winner/) [thank](/bip39-word/thank/) [year](/bip39-word/year/) [wave](/bip39-word/wave/) [sausage](/bip39-word/sausage/) [worth](/bip39-word/worth/) useful [legal](/bip39-word/legal/) [winner](/bip39-word/winner/) [thank](/bip39-word/thank/) [yellow](/bip39-word/yellow/) 

## Word #1920 in the Other 9 BIP39 Wordlists

[Czech](/czech/) vzchopit 

[French](/french/) tribunal 

[Italian](/italian/) ulisse 

[Japanese](/japanese/) やちん 

[Korean](/korean/) 한글 

[Portuguese](/portuguese/) tratador 

[Spanish](/spanish/) trozo 

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

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

## Similar Words — Check Carefully During Recovery

Words sharing the first three letters "use":

[use](/bip39-word/use/)[used](/bip39-word/used/)[useless](/bip39-word/useless/) 

## More BIP39 Words Starting with "U"

[ #1889 ugly ](/bip39-word/ugly/)[ #1916 urge ](/bip39-word/urge/)[ #1917 usage ](/bip39-word/usage/)[ #1918 use ](/bip39-word/use/)[ #1919 used ](/bip39-word/used/)[ #1921 useless ](/bip39-word/useless/)[ #1922 usual ](/bip39-word/usual/)[ #1923 utility ](/bip39-word/utility/) 

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

## Seed phrase, key and recovery guides

- [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/)
- [BIP85: Derive Many Seed Phrases From One Seed](/bip85/)

[ Full BIP39 Wordlist ](/)