---
title: "BIP39 Word #1256: ostrich — Seed Phrase Mnemonic Word"
url: "https://bip39-phrase.com/bip39-word/ostrich/"
language: "en"
updated: "2026-10-19T00:00:00+00:00"
---

Word #1256 10011100111 

# ostrich — BIP39 word #1256

"**ostrich**" is word #1256 of the 2048 words in the official BIP39 English wordlist, between [orphan](/bip39-word/orphan/) and [other](/bip39-word/other/). In a seed phrase it stands for the 11-bit value `10011100111`, decimal index 1255\. 

/ˈɒstrɪʧ/  · _noun:_ a very large fast-running bird that cannot fly 

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

## Binary Representation

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

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

[brother](/bip39-word/brother/)[table](/bip39-word/table/)[rude](/bip39-word/rude/)[mind](/bip39-word/mind/)[neutral](/bip39-word/neutral/)[ocean](/bip39-word/ocean/)[page](/bip39-word/page/)[over](/bip39-word/over/)[organ](/bip39-word/organ/)[original](/bip39-word/original/)[orphan](/bip39-word/orphan/) 

Position

Hex Index

0x4E7

4-Letter Prefix

ostr

## About "ostrich" in BIP39

- Two letters are enough: no other BIP39 word begins with **"os"**, which makes "ostrich" one of only 34 words that can be told apart this early.
- **"ostr"** is unique only within the English list: it also begins ostra in the [Spanish list](/spanish/) and ostraha in the [Czech list](/czech/), so a four-letter backup should say which list it uses.
- "ostrich" appears in one of the 24 official English [test vectors](https://github.com/trezor/python-mnemonic/blob/master/vectors.json) of BIP39: vector #18 (word 12 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 #18

[panda](/bip39-word/panda/) [eyebrow](/bip39-word/eyebrow/) [bullet](/bip39-word/bullet/) [gorilla](/bip39-word/gorilla/) [call](/bip39-word/call/) [smoke](/bip39-word/smoke/) [muffin](/bip39-word/muffin/) [taste](/bip39-word/taste/) [mesh](/bip39-word/mesh/) [discover](/bip39-word/discover/) [soft](/bip39-word/soft/) ostrich [alcohol](/bip39-word/alcohol/) [speed](/bip39-word/speed/) [nation](/bip39-word/nation/) [flash](/bip39-word/flash/) [devote](/bip39-word/devote/) [level](/bip39-word/level/) [hobby](/bip39-word/hobby/) [quick](/bip39-word/quick/) [inner](/bip39-word/inner/) [drive](/bip39-word/drive/) [ghost](/bip39-word/ghost/) [inside](/bip39-word/inside/) 

## Word #1256 in the Other 9 BIP39 Wordlists

[Czech](/czech/) podvod 

[French](/french/) miracle 

[Italian](/italian/) perbene 

[Japanese](/japanese/) ていき 

[Korean](/korean/) 우체국 

[Portuguese](/portuguese/) mensagem 

[Spanish](/spanish/) núcleo 

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

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

## More BIP39 Words Starting with "O"

[ #1252 organ ](/bip39-word/organ/)[ #1253 orient ](/bip39-word/orient/)[ #1254 original ](/bip39-word/original/)[ #1255 orphan ](/bip39-word/orphan/)[ #1257 other ](/bip39-word/other/)[ #1258 outdoor ](/bip39-word/outdoor/)[ #1259 outer ](/bip39-word/outer/)[ #1260 output ](/bip39-word/output/) 

[View all words starting with "O" ](/bip39-words/o/) 

## Seed phrase, key and recovery guides

- [Is My Seed Phrase Compromised? Signs and What to Do Next](/bip39-seed-phrase-compromise/)
- [BIP 32 Explained: Hierarchical Deterministic Wallets](/bip-32/)
- [Can You Guess a Seed Phrase? Probability and Real Risks](/can-you-guess-a-seed-phrase-probability-and-real-risks/)

[ Full BIP39 Wordlist ](/)