Bulk LINE Number Checker: CSV Upload and Result Export Guide
A LINE file answers a different question than a normal phone list. It answers "how far is this record from an official-account subscription?" and that...
Ethan works on phone-number normalization, E.164 formatting, country-code rules, carrier metadata, and line-type detection. His editorial work turns verification signals into practical workflows for CRM cleaning, SMS preparation, lead review, and bulk data operations.
View full author profile →A LINE file answers a different question than a normal phone list. It answers “how far is this record from an official-account subscription?” and that question needs two keys: the market and the segment. Drop either, and the file becomes numbers with no campaign shape. Bulk LINE Number Checker is the ZelNum page that supports this job: LINE Number Checker.
Quick answer
Build the CSV with one number per row, a record ID, a market column, and a segment column. Run the check, export with the on-LINE status per row, and read by market and segment. The market decides whether the on-LINE signal is worth anything; the segment decides whether the row goes through the OA invitation flow or plain outreach.
The two keys
| Key | What it decides |
|---|---|
| Market | Whether on-LINE means anything. Japan is strong, Indonesia is thin. |
| Segment | Whether the row is an OA invitation candidate or a general contact. |
A paying customer in Japan who is on LINE is the best row in the file. A trial user in a thin market who is on LINE is a different decision. The two keys together give the row its shape.
CSV setup
| Column | Why it is there |
|---|---|
record_id |
Joins the result back to the source. Keep it as text. |
input_number |
The original value, unchanged. |
market |
Japan / Taiwan / Thailand / Indonesia / other. |
segment |
Trial / paying / support / other. |
on_line |
The channel signal the check produces. |
checked_at |
The timestamp that makes re-checks comparable. |
One number per row, no merged cells, no notes columns inside the list.
Reading the export
An aggregated run over a mixed file comes back with distinct shapes per market:
| Market | On-LINE share | Read |
|---|---|---|
| Japan | 86% | The OA campaign lives here. |
| Taiwan | 79% | Strong secondary market, OA-first. |
| Thailand | 63% | Mixed, route by segment. |
| Indonesia | 38% | Thin, route to SMS. |
(These figures are illustrative, not a product performance claim.)
Within each market, the segment column splits the on-LINE rows into OA-invitation candidates (paying) and general outreach (trial and support).
Routing the export
- On LINE + paying segment + strong market → the OA invitation flow.
- On LINE + trial segment → nurture or general LINE messaging.
- Valid, not on LINE → SMS fallback.
- Invalid → repair or suppress.
- Unknown → retry.
Mistakes to avoid
- Dropping the market or segment column to keep the file tidy. Those are the keys that give the file its campaign shape.
- Treating “on LINE” as “subscribed.” The export counts tickets; the invitation flow converts them.
- Reading the file as one market. A flat percentage hides the Japan/Indonesia split that decides where the campaign runs.
FAQ
Why does LINE need two keys in the CSV?
Because the on-LINE signal is read two ways: the market decides whether it means anything, and the segment decides what to do with the row. One key cannot carry both.
What is the difference between market and segment?
Market is geography (Japan vs Indonesia). Segment is relationship (trial vs paying). Together they determine the value and the action for each row.
Can I export the on-LINE status for OA invitations?
Yes, and that is the main use. The on-LINE rows in the paying segment of strong markets are the OA invitation list.
How often should I re-check?
Quarterly as a baseline, plus a re-check before any big OA campaign. On-LINE status drifts as accounts go dormant.
Should I merge duplicates before uploading?
No. Leave them in and let the checker report per row. The duplicate count is data.
Related ZelNum pages
- LINE Number Checker API Workflow if the checks should run on a schedule.
- How to Use LINE Number Checker for Bulk List Checks for the step-by-step workflow.