---
title: "BIP39 Word #1025: length — Seed Phrase Mnemonic Word"
url: "https://bip39-phrase.com/bip39-word/length/"
language: "en"
updated: "2026-10-19T00:00:00+00:00"
---

Word #1025 10000000000 

# length — BIP39 word #1025

"**length**" is word #1025 of the 2048 words in the official BIP39 English wordlist, between [lend](/bip39-word/lend/) and [lens](/bip39-word/lens/). In a seed phrase it stands for the 11-bit value `10000000000`, decimal index 1024\. 

/lɛŋθ/  · _noun:_ the measurement of something from one end to the other 

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

## Binary Representation

A single 1-bit: 1024 is a power of two, like the indexes of [ability](/bip39-word/ability/), [able](/bip39-word/able/), [above](/bip39-word/above/), [absurd](/bip39-word/absurd/), [acoustic](/bip39-word/acoustic/), [advice](/bip39-word/advice/), [amount](/bip39-word/amount/), [avoid](/bip39-word/avoid/), [cactus](/bip39-word/cactus/) and [divorce](/bip39-word/divorce/).

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

[abandon](/bip39-word/abandon/)[scale](/bip39-word/scale/)[parade](/bip39-word/parade/)[mosquito](/bip39-word/mosquito/)[marine](/bip39-word/marine/)[lottery](/bip39-word/lottery/)[link](/bip39-word/link/)[library](/bip39-word/library/)[letter](/bip39-word/letter/)[leopard](/bip39-word/leopard/)[lens](/bip39-word/lens/) 

Position

Hex Index

0x400

4-Letter Prefix

leng

## About "length" in BIP39

- "length" has 6 letters, but the first four, **"leng"**, already identify it, because **"len"** also begins [lend](/bip39-word/lend/) and [lens](/bip39-word/lens/).
- **"leng"** is unique only within the English list: it also begins lengua in the [Spanish list](/spanish/), so a four-letter backup should say which list it uses.
- "length" appears in one of the 24 official English [test vectors](https://github.com/trezor/python-mnemonic/blob/master/vectors.json) of BIP39: vector #15 (word 24 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. As the last word of vector #15, its final 8 bits, **00000000**, are the checksum of the 24-word phrase.

Official test vector #15

[hamster](/bip39-word/hamster/) [diagram](/bip39-word/diagram/) [private](/bip39-word/private/) [dutch](/bip39-word/dutch/) [cause](/bip39-word/cause/) [delay](/bip39-word/delay/) [private](/bip39-word/private/) [meat](/bip39-word/meat/) [slide](/bip39-word/slide/) [toddler](/bip39-word/toddler/) [razor](/bip39-word/razor/) [book](/bip39-word/book/) [happy](/bip39-word/happy/) [fancy](/bip39-word/fancy/) [gospel](/bip39-word/gospel/) [tennis](/bip39-word/tennis/) [maple](/bip39-word/maple/) [dilemma](/bip39-word/dilemma/) [loan](/bip39-word/loan/) [word](/bip39-word/word/) [shrug](/bip39-word/shrug/) [inflict](/bip39-word/inflict/) [delay](/bip39-word/delay/) length 

## Word #1025 in the Other 9 BIP39 Wordlists

[Czech](/czech/) obsluha 

[French](/french/) incendie 

[Italian](/italian/) mirtillo 

[Japanese](/japanese/) そっこう 

[Korean](/korean/) 실컷 

[Portuguese](/portuguese/) impor 

[Spanish](/spanish/) lince 

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

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

## Similar Words — Check Carefully During Recovery

Words sharing the first three letters "len":

[lend](/bip39-word/lend/)[lens](/bip39-word/lens/) 

## More BIP39 Words Starting with "L"

[ #1021 legend ](/bip39-word/legend/)[ #1022 leisure ](/bip39-word/leisure/)[ #1023 lemon ](/bip39-word/lemon/)[ #1024 lend ](/bip39-word/lend/)[ #1026 lens ](/bip39-word/lens/)[ #1027 leopard ](/bip39-word/leopard/)[ #1028 lesson ](/bip39-word/lesson/)[ #1029 letter ](/bip39-word/letter/) 

[View all words starting with "L" ](/bip39-words/l/) 

## Seed phrase, key and recovery guides

- [BIP-444 (Now BIP 110): Reduced Data Temporary Softfork Explained](/bip-444-reduced-data-temporary-softfork/)
- [Metal Seed Phrase Backup: Steel Plates, Tiles and Tests](/metal-seed-phrase-backup/)
- [Invalid Seed Phrase? How to Find and Fix a Wrong Word (BIP39)](/how-to-fix-seed-phrase-errors/)

[ Full BIP39 Wordlist ](/)