---
title: "BIP39 Word #644: expire — Seed Phrase Mnemonic Word"
url: "https://bip39-phrase.com/bip39-word/expire/"
language: "en"
updated: "2026-10-19T00:00:00+00:00"
---

Word #644 01010000011 

# expire — BIP39 word #644

"**expire**" is word #644 of the 2048 words in the official BIP39 English wordlist, between [expect](/bip39-word/expect/) and [explain](/bip39-word/explain/). In a seed phrase it stands for the 11-bit value `01010000011`, decimal index 643\. 

/ɪkˈspaɪə/  · _verb:_ to come to the end of the period in which it is valid 

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

## Binary Representation

Four 1-bits and seven 0-bits; 330 of the 2048 indexes have exactly four 1-bits.

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

[spare](/bip39-word/spare/)[away](/bip39-word/away/)[idea](/bip39-word/idea/)[document](/bip39-word/document/)[flash](/bip39-word/flash/)[federal](/bip39-word/federal/)[fame](/bip39-word/fame/)[fabric](/bip39-word/fabric/)[extend](/bip39-word/extend/)[expand](/bip39-word/expand/)[expect](/bip39-word/expect/) 

Position

Hex Index

0x283

4-Letter Prefix

expi

## About "expire" in BIP39

- "expire" has 6 letters, but the first four, **"expi"**, already identify it, because **"exp"** also begins [expand](/bip39-word/expand/), [expect](/bip39-word/expect/), [explain](/bip39-word/explain/), [expose](/bip39-word/expose/) and [express](/bip39-word/express/).
- **"expi"** is unique only within the English list: it also begins expirar in the [Portuguese list](/portuguese/), so a four-letter backup should say which list it uses.

## Word #644 in the Other 9 BIP39 Wordlists

[Czech](/czech/) kopnout 

[French](/french/) éligible 

[Italian](/italian/) fenomeno 

[Japanese](/japanese/) こぜん 

[Korean](/korean/) 별도 

[Portuguese](/portuguese/) donzela 

[Spanish](/spanish/) espuma 

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

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

## Similar Words — Check Carefully During Recovery

Read aloud, "expire" /ɪkˈspaɪə/ is one sound away from this word: 

[inspire /ɪnˈspaɪə/](/bip39-word/inspire/) 

Words sharing the first three letters "exp":

[expand](/bip39-word/expand/)[expect](/bip39-word/expect/)[explain](/bip39-word/explain/)[expose](/bip39-word/expose/)[express](/bip39-word/express/) 

## More BIP39 Words Starting with "E"

[ #640 exit ](/bip39-word/exit/)[ #641 exotic ](/bip39-word/exotic/)[ #642 expand ](/bip39-word/expand/)[ #643 expect ](/bip39-word/expect/)[ #645 explain ](/bip39-word/explain/)[ #646 expose ](/bip39-word/expose/)[ #647 express ](/bip39-word/express/)[ #648 extend ](/bip39-word/extend/) 

[View all words starting with "E" ](/bip39-words/e/) 

## Seed phrase, key and recovery guides

- [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/)
- [BIP39 Passphrase: How the 25th Word Creates a Hidden Wallet](/bip39-passphrase/)

[ Full BIP39 Wordlist ](/)