What is a valid Line number? ——Definition, usage and batch testing methods

In overseas marketing in Southeast Asia and Taiwan markets, Line valid number is a concept that appears frequently. Simply put, a valid Line number refers to a mobile phone number that has been registered on the Line platform, has a normal account status, and can currently send and receive messages. It is different from an open number that has only been “registered”, and it is also different from an active number that has been “recently active”, but a reachable prerequisite between the two - as long as the number can receive Line messages, it is considered valid.

For teams that need to reach customers in batches (such as cross-border e-commerce private message promotion, community recruitment, event invitations), line valid number is the first step in data cleaning. If a large number of imported numbers are invalid or have been canceled, it will not only waste detection costs, but also increase the risk of account ban. This article will help you fully understand this key indicator from definition, comparison, application scenarios to practical testing.

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What is a valid Line number?

From a technical perspective, a valid Line number means that after verification through the specific interface of the Line protocol, it is confirmed that the account is in a state that can receive messages normally. Detection logic usually includes:

• Whether the account has been registered (check by mobile phone number or uid);
• Whether the account has not been canceled or banned;
• Whether the account has any login or network connection records in the recent past (some detection methods will check the online status).

Different from “open numbers”, line valid numbers exclude those numbers that have closed accounts, have not logged in for a long time, and may be recycled. It ensures that your message can actually be delivered to the other party’s client, and is the core indicator for judging the “availability” of a number.

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What is the difference between a valid Line number, a Line activated number and an active number?

Many users confuse these three concepts. The following table provides a visual comparison:

Detection dimensions	Definition	Typical scenarios	Whether reachability is guaranteed
Registered number	This mobile phone number has previously registered a Line account (whether it is available now or not)	Preliminarily screen the number library to exclude unregistered numbers	No (may have been canceled)
Valid number	The account is currently registered and can receive messages	Used for private messaging and group invitations	Yes (verified)
Active number	Have logged in or sent messages recently (such as within 7 days/30 days)	Precise marketing to high-intention customers	Yes, and feedback will be more timely

Activated number vs valid number

Opening a number only indicates that the user has “registered”. For example, if a number was registered with Line two years ago but was later abandoned, and the account was recycled or frozen by the system, you can still find “Activation” at this time, but the other party cannot receive the message. line valid number has additional status verification to ensure that the account is currently “alive”.

Valid number vs active number

Active numbers usually refer to actual usage traces in the recent period (such as within 30 days). For valid numbers, the conditions are relaxed - as long as the account is currently contactable, the other party may not be online for a few months, but as long as the Line account is still there, it is still considered valid. For marketing scenarios, the effective number is more commonly used because it covers a large number of “silent but reachable” potential customers; while the active number is suitable for scenarios that require immediate response (such as customer service, promotional flash sales activities).

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Why do overseas marketing need to pay attention to valid Line numbers?

Line has high penetration rates in multiple markets: Vietnam (approximately 70% of smartphone users use it), Thailand (more than 90% users), Taiwan (the penetration rate ranks first in the world), Indonesia, Japan, etc. In these regions, Line is one of the core channels for companies to communicate with consumers.

There are three main advantages to using line valid number to acquire customers overseas:

1. Reduce invalid contacts and reduce the risk of account suspension If you send a large number of messages to a canceled or unregistered number, the Line system will determine that your account is a “harassment account”, which will limit the number of messages in the least case and ban the account in the worst case. Only filtering valid numbers can greatly reduce the probability of account ban.

2. Improve conversion rate When advertising or event invitations are pushed to real and contactable users, the conversion rate is naturally higher than blind mass messaging. Especially when combined with the Line gender field (see below), it can further filter out male/female users and achieve more precise targeted marketing.

3. Basic steps of data cleaning When importing a number list purchased from a third party, it often contains a large number of invalid numbers. First perform the line valid number detection, and then perform secondary classification based on the results, which can save subsequent operating costs and avoid waste of resources.

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How to detect valid Line numbers in batches? ——Take KK-DATA as an example

KK-DATA is a customer acquisition data screening platform that supports batch detection of valid Line numbers and export of fields such as gender and uid. The whole process is divided into three steps. There is no subscription fee and billing is per item.

Step 1: Prepare the number list

• Numbers need to be in international format (such as +84381234567 or 0084381234567), one line per line, and saved as CSV or TXT.
• If you don’t have a number list yet, you can use KK-DATA’s Global Number Generation module (free) to randomly generate numbers by country and number segment; you can also import it from a custom number segment CSV.

Step 2: Submit Line screening task

1. Log in to KK-DATA Console.
2. Select “Screen Number” → “Line Screen Number”.
3. Upload the number file.
4. Check “Line valid” in the detection type (if necessary, check “Line activation”, “Line gender” and “Export uid” at the same time).
5. The system will estimate the cost of this task (for details on the unit price, please see the real-time price on the console, and the prices are different for different detection types).
6. Submit the task after confirmation. You can receive Telegram notifications after the task is completed (need to bind @kkdata_robot).

Step 3: View the results and export

• After the task is completed, download the result file (CSV/TXT) in the console, including fields: mobile phone number, whether it is valid, gender, uid, etc.
• The platform has a built-in data deduplication warehouse, and duplicate numbers will not be deducted twice to avoid waste.

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What are the common misunderstandings in detecting valid Line numbers?

Misunderstanding 1: The activated number is a valid number As mentioned above, activation only means that it has been registered, but does not mean that it is currently available. It is recommended that the “valid” field prevail.

Myth 2: Test results are 100% real-time and accurate Due to factors such as network fluctuations and instantaneous changes in account status, the detection results are not absolutely accurate. However, the accuracy of regular screening platforms can generally reach more than 95% (based on a large number of actual measurement comparisons), which is of high reference value for marketing scenarios.

Myth 3: Detection will cause the Line account to be risk controlled KK-DATA’s detection does not involve user passwords or logins. It is only verified through public protocols and will not cause any security risks to the target account. There is no need to worry about your detection account (used for submitting tasks) being blocked because the platform uses a dedicated server pool and will not be associated with your personal Line.

Myth 4: The more tasks in a single task, the better Although the platform supports a maximum of about 1 million numbers at a time, it is recommended to split the large list into small batch submissions of 100,000–200,000, which is beneficial to task success rate and result stability. At the same time, you can also control your budget more flexibly.

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How to improve the accuracy of Line valid number detection?

The following best practices can help you get more reliable results:

1. Use the “seed” number to verify the accuracy of the platform Prepare a small number of test numbers whose status you know (such as absolutely valid personal lines, definitely canceled numbers), upload the test numbers, and compare the results. This builds confidence in the accuracy of the platform.

2. Regular re-checking of the same number Line accounts may become invalid due to user logout, freezing, etc. It is recommended to recheck the existing valid number database once a month or quarterly.

3. Combined with the Line gender field for secondary screening If the marketing target has a gender preference, you can also check “Line Gender” during detection. The results will return male, female, or unknown to facilitate your targeted targeting. The uid can also be exported for subsequent use in sending messages through the system interface.

4. Remove duplication and classify test results After downloading the results, use Excel or a script to create a tiered pool of customers sorted by “valid/inactive/gender.” Invalid numbers can be deleted directly to reduce subsequent costs.

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FAQ

Question: What is the difference between a valid Line number and a Line activated number?

Answer: Line activated number only means that the mobile phone number has previously registered a Line account, but may have been logged out, banned, or has not logged in for a long time. The valid Line number has been further verified to confirm that the account is currently in a state where messages can be sent and received, making it a more reliable marketing target.

Question: Do I need to provide a password or login verification to detect a valid Line number?

Answer: No. Formal screening platforms such as KK-DATA perform one-way verification through the Line public protocol or back-end interface. You do not need to provide a password or log in to your personal account, so it will not affect the security of your account.

Question: Can Line valid number detection distinguish male/female?

Answer: Yes. Some screening platforms (such as KK-DATA) support Line gender field detection, and the results include gender (male, female, etc.) and uid and other information to facilitate your targeted marketing.

Question: How many Line numbers can be detected at a time?

Answer: The maximum number submitted for a single task is about 1 million. However, for millions of data, it is recommended to submit it in batches (for example, 200,000 items per batch) to reduce the risk of task failure. Please refer to the real-time price of the console for the unit price. An estimated deduction will be displayed before submission.

Question: What is the use of the Line uid exported after detection?

Answer: uid is the user’s unique identifier within Line. Under the premise of obtaining user authorization, you can accurately send messages using uid through Line Messaging API and other channels, without requiring the other party’s mobile phone number. However, please note that using uid to reach should also comply with Line’s developer policies to avoid abuse.

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line valid number is a part that cannot be ignored in overseas marketing. Whether it is cleaning historical data, screening high-quality accounts, or making targeted advertising based on gender, mastering the correct detection methods can help you get twice the result with half the effort. If you are looking for an efficient, pay-as-you-go screening platform, you might as well try KK-DATA.

👉Log in to the console to start screening numbers Two-way contact customer service: https://t.me/kkdata_robot For more features and billing details, please see Usage Document and Billing Page.