A must-read for newbies: What are the valid numbers for Line? How to obtain and verify the complete guide

In the field of overseas marketing and social e-commerce, Line is an important channel covering markets such as Japan, Taiwan, Thailand, and Indonesia. When many novice teams first come into contact with Line promotion, the most common pain points are: having a batch of numbers on hand, but not knowing which ones are actually usable; blindly sending messages, resulting in a large number of failures or even account closure. Understanding what Line Valid Number is and mastering the verification method is the first step to get started.

This article is specially written for novices going overseas. It uses the most straightforward language to explain the definition of a valid Line number, the difference from an active number, manual and batch verification methods, and common pitfalls. After reading this, you will be able to get started and avoid wasting time and budget.

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What is a valid Line number? Concepts that novices need to understand first

Line valid number refers to a mobile phone number that has been registered on the official Line server and is currently in a state where messages can be received normally. Specifically, it must meet three conditions:

• The number itself actually exists (non-empty number, non-virtual number segment and invalid number)
• The number has previously registered an account with Line (i.e. “activated”)
• The account has not been officially banned or deactivated by Line or the user has actively logged out

In a marketing scenario, why must I first verify whether it is a valid Line number? The reason is simple:

1. Sending messages from invalid numbers not only wastes costs, but also triggers platform risk control — Line will judge high-frequency invalid messages as harassment, which will range from restricting functions to banning marketing accounts.
2. A valid number is the prerequisite for accurate contact — Only by confirming the existence of the other party’s account can the benefits, invitations, and notifications you send have a chance to be seen.
3. Different business scenarios require different levels of verification: Basic mass messaging only needs to be “valid”, while high-conversion activities need to be “active”.

Therefore, the first thing that novices should keep in mind is: **“I have 100,000 numbers” does not mean “I have 100,000 Line users”. Screen for effectiveness first, and then talk about conversion. **

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What is the difference between Line valid number and active number?

Many newbies confuse “effective” with “active.” In fact, the two are different verification dimensions. Here is a table to help you quickly distinguish:

Comparison dimensions	Line valid number	Line active number
Definition	The account has been registered and can receive messages	The account has been online or operated in the recent past (such as within 7 days/30 days)
Detection logic	Confirm that the account exists and is not banned	On the basis of validity, additionally detect recent login time or online behavior
Marketing Value	Ensure that messages can be delivered	Ensure that users have been active recently and are more likely to interact with messages
Applicable scenarios	Initial contact, registration invitation, verification and recycling	Second contact, event promotion, accurate private message

Valid number applicable scenarios

• Number Cleaning: From the number pool collected from own data and public channels, we first screen out the valid parts and eliminate invalid and empty numbers.
• Low-cost mass messaging: If your marketing goal is to inform widely (such as product launch notification), just use a valid number, and there is no need to pursue a high activity rate.
• Registration Guide: Send a “Come back to receive discounts” message to users who have registered but may no longer use it. A valid number is sufficient.

Applicable scenarios for active numbers

• Highly interactive activities: In scenarios such as promotions, group buying, and lottery that require users to respond immediately, active numbers must be selected, otherwise the open rate will be extremely low.
• Second touch: The first message was opened but not converted. The second time the message is sent, the success rate for active users is higher.
• Accurate Data Analysis: Fields such as gender and age of active users are more reliable and suitable for user portraits.

Summary in one sentence: Effectively solve “can I post it”, and actively solve “will anyone read it if I post it”. Both can be filtered at the same time and used according to business stage.

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How can a novice manually verify whether a single Line number is valid?

If you only have a few dozen numbers to confirm, here are three manual methods you can try:

1. Add friend in Line: Enter the target number (area code required). If the other party’s account exists, the avatar and nickname will be displayed; if “User not found” is displayed, the explanation is invalid.
2. Search by ID: If you know the other party’s Line ID (not mobile phone number), search directly. If successful, it means that the account corresponding to the ID is valid.
3. Observe the receipt after sending the invitation link: Generate a friend link and send it to the target number. If the other party has registered, you will receive a notification (but this method relies on the other party’s operation and is not direct enough).

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How to verify valid Line numbers in batches? 2 efficient methods

When the number of numbers reaches hundreds, thousands or even tens of thousands, manual methods are completely unfeasible. You need an automation solution.

Method 1: Homemade script or crawler

Theoretically, you can use Python to simulate Line’s API requests or protocols to write verification scripts by yourself. But there are several practical issues here:

• High technical threshold: You need to reverse engineer Line’s communication protocol, or use a third-party unofficial SDK, which has extremely high maintenance costs.
• Easy to trigger risk control: Line is very strict in detecting simulated requests, self-made scripts will be blocked soon, and IPs and devices will be marked.
• Unstable results: Every time Line is updated, your script may need to be rewritten, which is not suitable for long-term use.

Conclusion: It is not recommended for novices to develop independently. The time and risk involved are much higher than the benefits.

Method 2: Use a professional screening platform (such as KK-DATA)

For the vast majority of overseas teams, the most worry-free way is to use the mature Line screening platform. Taking KK-DATA as an example, its workflow is as follows:

1. Register and Deposit: Visit https://app.kkdata.cc/ to register an account and use USDT (TRC20) to recharge the balance with a minimum of about 50 USDT.
2. Upload number list: Supports CSV or TXT format, one number per number, and can detect up to about 1 million numbers at a time.
3. Select detection type: Select “Line enabled/valid” detection in the console, or also select “Line gender” (including male/female/unknown) and other fields.
4. Submit task: The system will display the estimated cost and submit it after confirmation. After the task is completed, you will be notified through Telegram (need to bind the official notification robot https://t.me/kkdata_robot).
5. Export Results: CSV or TXT format, including the “valid/invalid” status of each number and additional fields of your choice.

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What are the common fields in Line valid number verification results?

When you get a result exported by the screening platform (such as a CSV file), you will usually see the following fields. Understanding these meanings can help you make better use of your data:

Field name	Meaning	Usage examples
Number	The original mobile phone number you uploaded	Used to match the original data
Activated/valid	true means that the number has been registered with Line and is available	Filter the reachable user groups
Gender	男 / 女 / 未知	Target marketing to male or female users
uid	The unique identifier assigned to the user by Line (can be exported by some platforms)	Can be used for more accurate ID tracking (some functions require platform support)
Other custom fields	Some platforms may provide age ranges, avatars, country codes, etc.	Further refine user portraits

Note: Gender detection is not 100% accurate. The platform infers based on public data (such as avatar, nickname, friend circle, etc.), but the overall accuracy rate can meet the needs of marketing targeting. Don’t expect ID card-like accuracy.

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The 3 most common mistakes novices make when using Line valid numbers

Mistake 1: Ignore Line’s official anti-spam policy and blindly send messages in bulk

After getting a batch of valid numbers, many novices can’t wait to send messages in batches, only to have their accounts quickly blocked. A valid number only guarantees that “the other party exists”, it does not mean that you can send without restraint. **Line has limits on the number, frequency, and content duplication of new friend messages sent by the same account every day. ** Recommendation: First use a small account to test according to the stepped frequency, control it at 50 to 100 messages/day/account, and gradually increase it.

Mistake 2: Failure to deduplicate and repeat detection wastes costs

If you have multiple batches of numbers and submit them directly to the number screening platform without deduplication, it will cause the same number to be tested repeatedly and waste your balance. KK-DATA provides a “data deduplication warehouse” function, which will automatically merge duplicate items before you upload your number to avoid repeated deductions. Newbies must make good use of this feature.

Mistake 3: Only focus on quantity, not quality (ignore gender and other characteristics)

Many times the number of “valid numbers” is large, but the actual ratio of men to women is seriously unbalanced (for example, they are all men), resulting in dismal results in promoting your product to women. It is recommended to select the “Gender” field to filter when verifying, and only retain males or females according to your target user group. Similarly, if you need a high-activity scene, remember to check “active” detection instead of just looking at the valid ones.

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Summary: Core steps for beginners to get started with Line valid numbers

Follow these 4 steps and you’ll get started quickly:

1. Understand the concept: Distinguish between “effective” and “active”, and choose different detection types in different scenarios.
2. Select verification tool: Manual verification is only suitable for single-digit testing; it is recommended to use professional platforms such as KK-DATA for batch verification, which saves time and effort.
3. Execute batch detection: Upload the number → Select the detection item (at least select “Enable/Valid”) → Submit the task → Export CSV.
4. Filtering features based on needs: Secondary filtering based on marketing goals (gender, activity, etc.) to ensure that each number can be put to its best use.

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FAQ

Question: What does a valid Line number mean?

Answer: A valid Line number refers to a complete mobile phone number that has registered a Line account and can currently receive messages. Excludes unregistered, deactivated or canceled numbers. Validation is the basis of subsequent marketing.

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

Answer: A valid number only means that the account exists and is available; an active number means that the account has logged in or operated in the recent past (such as within 7 days or 30 days). Both can be screened at the same time to meet different reach strategies.

Question: How to verify whether a Line number is valid?

Answer: You can confirm by manually adding the other party in Line, searching for ID, or observing the feedback after sending an invitation message. For batch verification, it is recommended to use a professional platform such as KK-DATA. After uploading the number, it will automatically detect and export the “valid/invalid” result.

Question: Where can newbies get a valid Line number?

Answer: You can collect a number pool from your own customer data and public channels, and then use batch verification tools to filter out valid numbers. Never purchase “purely valid” numbers from unknown sources, as they are prone to duplicate or invalid data.

Question: Will using a valid Line number for marketing result in account ban?

Answer: If the sending frequency is too high, the content is illegal, or a large number of newly registered Line messages are sent, there is indeed a risk of account ban. It is recommended to match active numbers, reasonably control the volume sent in a single day, and use high-quality filter data to reduce invalid contacts.

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👉 Log in to the console to start screening numbers If you have any questions during the operation, you are welcome to get real-time help through Two-way Contact Customer Service.
For more detailed usage guide, please refer to Usage Document, or visit the official website https://kkdata.cc/ to learn about the complete functions.