---
title: "BIP39 Word #1229: office — Seed Phrase Mnemonic Word"
url: "https://bip39-phrase.com/bip39-word/office/"
language: "en"
updated: "2026-10-19T00:00:00+00:00"
---

Word #1229 10011001100 

# office — BIP39 word #1229

"**office**" is word #1229 of the 2048 words in the official BIP39 English wordlist, between [offer](/bip39-word/offer/) and [often](/bip39-word/often/). In a seed phrase it stands for the 11-bit value `10011001100`, decimal index 1228\. 

/ˈɒfɪs/  · _noun:_ a room or building where people work at desks 

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

## Binary Representation

Five 1-bits and six 0-bits; 462 of the 2048 indexes have exactly five 1-bits.

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

[book](/bip39-word/book/)[sunset](/bip39-word/sunset/)[ridge](/bip39-word/ridge/)[maze](/bip39-word/maze/)[muscle](/bip39-word/muscle/)[outside](/bip39-word/outside/)[oppose](/bip39-word/oppose/)[obtain](/bip39-word/obtain/)[october](/bip39-word/october/)[oil](/bip39-word/oil/)[often](/bip39-word/often/) 

Position

Hex Index

0x4CC

4-Letter Prefix

offi

## About "office" in BIP39

- "office" has 6 letters, but the first four, **"offi"**, already identify it, because **"off"** also begins [off](/bip39-word/off/) and [offer](/bip39-word/offer/).
- Its first letters also spell another BIP39 word, [off](/bip39-word/off/). Write "office" out in full: cut short, it turns into a different valid word.
- **"offi"** is unique only within the English list: it also begins officier in the [French list](/french/), so a four-letter backup should say which list it uses.
- "office" appears in one of the 24 official English [test vectors](https://github.com/trezor/python-mnemonic/blob/master/vectors.json) of BIP39: vector #14 (word 14 of 18). 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 #14

[gravity](/bip39-word/gravity/) [machine](/bip39-word/machine/) [north](/bip39-word/north/) [sort](/bip39-word/sort/) [system](/bip39-word/system/) [female](/bip39-word/female/) [filter](/bip39-word/filter/) [attitude](/bip39-word/attitude/) [volume](/bip39-word/volume/) [fold](/bip39-word/fold/) [club](/bip39-word/club/) [stay](/bip39-word/stay/) [feature](/bip39-word/feature/) office [ecology](/bip39-word/ecology/) [stable](/bip39-word/stable/) [narrow](/bip39-word/narrow/) [fog](/bip39-word/fog/) 

## Word #1229 in the Other 9 BIP39 Wordlists

[Czech](/czech/) plevel 

[French](/french/) mener 

[Italian](/italian/) pargolo 

[Japanese](/japanese/) つごう 

[Korean](/korean/) 완전 

[Portuguese](/portuguese/) marinho 

[Spanish](/spanish/) neón 

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

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

## Similar Words — Check Carefully During Recovery

Words sharing the first three letters "off":

[off](/bip39-word/off/)[offer](/bip39-word/offer/) 

## More BIP39 Words Starting with "O"

[ #1225 october ](/bip39-word/october/)[ #1226 odor ](/bip39-word/odor/)[ #1227 off ](/bip39-word/off/)[ #1228 offer ](/bip39-word/offer/)[ #1230 often ](/bip39-word/often/)[ #1231 oil ](/bip39-word/oil/)[ #1232 okay ](/bip39-word/okay/)[ #1233 old ](/bip39-word/old/) 

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

## Seed phrase, key and recovery guides

- [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/)
- [Ethereum Keystore File (JSON Wallet): Structure and Security](/json-wallets-explained/)

[ Full BIP39 Wordlist ](/)