---
title: "BIP39 Word #2048: zoo — Seed Phrase Mnemonic Word"
url: "https://bip39-phrase.com/bip39-word/zoo/"
language: "en"
updated: "2026-10-19T00:00:00+00:00"
---

Word #2048 11111111111 

# zoo — BIP39 word #2048

"**zoo**" is the last of the 2048 words in the official BIP39 English wordlist, right after [zone](/bip39-word/zone/). In a seed phrase it stands for the 11-bit value `11111111111`, decimal index 2047\. 

/zuː/  · _noun:_ a place where wild animals are kept for people to see 

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

## Binary Representation

All eleven bits are 1: it is the only index without a 0-bit.

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

[lend](/bip39-word/lend/)[say](/bip39-word/say/)[that](/bip39-word/that/)[useful](/bip39-word/useful/)[wave](/bip39-word/wave/)[winner](/bip39-word/winner/)[worth](/bip39-word/worth/)[year](/bip39-word/year/)[youth](/bip39-word/youth/)[zero](/bip39-word/zero/)[zone](/bip39-word/zone/) 

Position

Hex Index

0x7FF

4-Letter Prefix

zoo

## About "zoo" in BIP39

- It takes all three letters to identify "zoo": **"zo"** also begins [zone](/bip39-word/zone/). Three letters are enough for only 604 of the 2048 words.
- "zoo" appears in three of the 24 official English [test vectors](https://github.com/trezor/python-mnemonic/blob/master/vectors.json) of BIP39: vectors #4 (words 1–11 of 12), #8 (words 1–17 of 18) and #12 (words 1–23 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 #4

zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo [wrong](/bip39-word/wrong/) 

## Word #2048 in the Other 9 BIP39 Wordlists

[Czech](/czech/) zvyk 

[French](/french/) zoologie 

[Italian](/italian/) zuppa 

[Japanese](/japanese/) われる 

[Korean](/korean/) 힘껏 

[Portuguese](/portuguese/) zumbido 

[Spanish](/spanish/) zurdo 

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

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

## Similar Words — Check Carefully During Recovery

Read aloud, "zoo" /zuː/ is one sound away from these 3 words: 

[shoe /ʃuː/](/bip39-word/shoe/)[two /tuː/](/bip39-word/two/)[you /juː/](/bip39-word/you/) 

## More BIP39 Words Starting with "Z"

[ #2045 zebra ](/bip39-word/zebra/)[ #2046 zero ](/bip39-word/zero/)[ #2047 zone ](/bip39-word/zone/) 

[View all words starting with "Z" ](/bip39-words/z/) 

## Seed phrase, key and recovery guides

- [Recover Lost Bitcoin: Find Wallet Backups and Seed Phrases](/recover-lost-bitcoin-find-wallet-backups/)
- [Seed Phrase vs Private Key: What's the Difference?](/seed-phrase-vs-private-key/)
- [Private Key QR Code Risks: Why Online Generators Are Unsafe](/qr-code-private-key-security-risks/)

[ Full BIP39 Wordlist ](/)