# 4di.cn

- **Website:** <https://4di.cn>
- **Primary alias:** `4di.cn`

## Description

四地网 (www.4di.cn) is a Chinese-language website offering a collection of free online lookup and reference tools. Its services include checking and validating Chinese identity card numbers, exploring the administrative regions associated with number prefixes, and browsing lists of regional codes. Visitors can also use tools for zodiac and horoscope queries, credit card number generation and validation, IP address lookup, foreign exchange rates, and mobile phone number location searches. The site brings together practical utilities with general reference content, including national and international weather forecasts, Chinese herbal medicine information, idioms, quotations, and Chinese dictionaries. It also features stock index information for the Shanghai and Shenzhen markets, with chart views organized by daily, weekly, monthly, and yearly periods. Search prompts and regional weather links help users navigate popular queries. The website describes its tools as free and reports cumulative identity-number validation statistics. It notes that some page data comes from the internet and provides an email address for reporting content concerns.

## Industries

- 🗺 Reference Materials
- 🗺 Public Records and Directories _(under Reference Materials)_

## Logos & icons

- logo _(primary)_ — PNG — [download](https://cdn.brandfetch.io/id2PC5ORBw/w/147/h/50/theme/dark/logo.png?c=1bxid64Mup7aczewSAYMX&t=1791166372141)

## Colors

| Name | Hex | Theme |
| --- | --- | --- |
| Smalt | #003399 | accent |
| Milano Red | #d81e06 | dark |
| Celery | #c4ca60 | light |

---

_Source: <https://brandfetch.com/4di.cn>_
_See [/llms.txt](/llms.txt) for a full list of agent-readable pages, and [/auth.md](/auth.md) for how agents authenticate._