---
title: "BIP39 Word #285: castle — Seed Phrase Mnemonic Word"
url: "https://bip39-phrase.com/bip39-word/castle/"
language: "en"
updated: "2026-10-19T00:00:00+00:00"
---

Word #285 00100011100 

# castle — BIP39 word #285

"**castle**" is word #285 of the 2048 words in the official BIP39 English wordlist, between [casino](/bip39-word/casino/) and [casual](/bip39-word/casual/). In a seed phrase it stands for the 11-bit value `00100011100`, decimal index 284\. 

/ˈkɑːsᵊl/  · _noun:_ a large fortified building with thick walls and towers 

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

## 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):

[phone](/bip39-word/phone/)[glory](/bip39-word/glory/)[adjust](/bip39-word/adjust/)[crime](/bip39-word/crime/)[clog](/bip39-word/clog/)[chest](/bip39-word/chest/)[canoe](/bip39-word/canoe/)[card](/bip39-word/card/)[cart](/bip39-word/cart/)[cat](/bip39-word/cat/)[casual](/bip39-word/casual/) 

Position

Hex Index

0x11C

4-Letter Prefix

cast

## About "castle" in BIP39

- "castle" has 6 letters, but the first four, **"cast"**, already identify it, because **"cas"** also begins [case](/bip39-word/case/), [cash](/bip39-word/cash/), [casino](/bip39-word/casino/) and [casual](/bip39-word/casual/).
- **"cast"** is unique only within the English list: it also begins castor in the [Spanish list](/spanish/), castello in the [Italian list](/italian/) and castelo in the [Portuguese list](/portuguese/), so a four-letter backup should say which list it uses.

## Word #285 in the Other 9 BIP39 Wordlists

[Czech](/czech/) dozorce 

[French](/french/) brioche 

[Italian](/italian/) calesse 

[Japanese](/japanese/) おそわる 

[Korean](/korean/) 꼭대기 

[Portuguese](/portuguese/) bicudo 

[Spanish](/spanish/) bruto 

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

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

## Similar Words — Check Carefully During Recovery

 One BIP39 word differs from "castle" by just a single letter — the most common source of typos when a seed phrase is entered by hand: 

[cattle](/bip39-word/cattle/) 

Words sharing the first three letters "cas":

[case](/bip39-word/case/)[cash](/bip39-word/cash/)[casino](/bip39-word/casino/)[casual](/bip39-word/casual/) 

## More BIP39 Words Starting with "C"

[ #281 cart ](/bip39-word/cart/)[ #282 case ](/bip39-word/case/)[ #283 cash ](/bip39-word/cash/)[ #284 casino ](/bip39-word/casino/)[ #286 casual ](/bip39-word/casual/)[ #287 cat ](/bip39-word/cat/)[ #288 catalog ](/bip39-word/catalog/)[ #289 catch ](/bip39-word/catch/) 

[View all words starting with "C" ](/bip39-words/c/) 

## Seed phrase, key and recovery guides

- [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/)
- [Crypto Inheritance: How to Pass On Your Seed Phrase](/crypto-inheritance/)

[ Full BIP39 Wordlist ](/)