Zalo Number Checker — Bulk Verify Numbers on Zalo
Check Zalo registration and activity for number lists.
What is Zalo?
Zalo is a mobile-first instant messaging and voice-over-IP app with built-in social features, developed by the Vietnamese technology group VNG Corporation. It combines one-to-one and group chat, voice and video calling, a personal timeline for sharing moments, and a business layer (Zalo Official Accounts and Zalo Business) that companies use to reach customers. In Vietnam it functions less like a single-purpose messenger and more like an everyday utility, spanning personal chat, payments and government and business communication.
Official site: zalo.me · Developed by VNG Corporation · Launched 2012
History
VNG began developing Zalo in late 2011 and released the first public version in December 2012, after an initial test build in August that year. Built specifically for Vietnamese networks and language, it grew quickly against global rivals and became the most-used messaging app in the country. Over the following years VNG expanded Zalo well beyond chat — adding short video, a private feed, cloud storage (zCloud), and a business and advertising ecosystem — turning it into a super-app for the Vietnamese market.
How many people use Zalo?
Zalo is the dominant messaging platform in Vietnam, ahead of global apps such as Facebook Messenger. VNG reported roughly 77.6 million monthly active users in late 2024, and Vietnamese media reported the base reaching about 79.6 million monthly active users by the end of 2025, with more than two billion messages sent per day — used by an estimated 85% of Vietnamese internet users.
Sources: VietnamNet — Zalo used by 85% of Vietnamese, Tuoi Tre — Zalo tops 80 million users
Who uses Zalo?
Zalo’s core audience is the general population of Vietnam — it is used across all provinces and by every age group for personal messaging, and by businesses and public bodies for official communication through Zalo Official Accounts. Outside Vietnam, most users are members of the Vietnamese diaspora staying in touch with family, friends and business contacts back home.
Where Zalo is used
Zalo is overwhelmingly a Vietnamese platform: it is available in all 34 provinces and municipalities and reaches an estimated 85% of the country’s internet users. It is accessible in more than 20 countries worldwide, where adoption tracks the Vietnamese diaspora — most heavily the United States, Japan, South Korea, Australia, Germany, Myanmar and Singapore.
- Vietnam
- United States
- Japan
- South Korea
- Australia
- Germany
- Myanmar
- Singapore
A Zalo number check tells you which phone numbers in a list are actually connected to Zalo — before you spend budget messaging or advertising to them. You upload a list of numbers, we verify each one against Zalo, and you download a clean report marking which are registered and which are not. Nothing is ever sent to the numbers you check, so the people on your list are never contacted or notified during verification.
On top of a registration lookup, Zalo checking here can flag which numbers sit behind accounts that are actually in use, so you can prioritise reachable contacts and drop dormant ones before a campaign.
Every check is priced per number and the rate is shown before you run anything, so a large list has no surprise cost. Results come back as a downloadable report you can feed straight back into your CRM, dialer or ad audience.
New to list hygiene? Start by cleaning your file with the free list cleaner or checking a single number in the number lookup. If you also message on other platforms, see the Telegram checker or the full Zalo check tiers below.
How Zalo number checking works
Upload your list
Bring your numbers as a plain list — any common format. They are normalised to E.164 (correct country code and national length) so malformed rows do not silently fail.
Checked against Zalo
Each number is verified against Zalo for the tiers you selected — registration and, where available, activity and profile signals.
Download a clean report
You get a per-number report marking each result, ready to import back into your tools. The people on your list are never messaged during the check.
Zalo checks, tiers & pricing
| Check | Tier | Returns | Price / number | Per 10,000 | Action |
|---|---|---|---|---|---|
| Zalo Registration Check | Registration | Registration status | $0.0011 | $11.00 | Check now |
| Zalo Activity Check | Activity | Active user status | $0.0013 | $13.00 | Check now |
Estimate your Zalo check cost
Checks are billed per number at the lowest tier — no subscription, no minimum. Enter a list size to see the cost.
Check Zalo numbers via API
Prefer to automate? Every Zalo check here is also available through the psyke Reseller API — submit a list, poll for completion, and download results programmatically. Requests authenticate with a single API key header, and each check maps to a service code you pass in the request:
zalo-registeredZalo Registration Checkzalo-activeZalo Activity Check
See the full API reference, the services catalog, and rate limits & billing — or grab the OpenAPI spec to generate a client.
Who uses a Zalo check
For marketing teams
Clean a list before a Zalo broadcast so budget only goes to numbers that can actually receive it — and deliverability metrics stay honest.
For sales & lead gen
Qualify inbound leads by confirming a Zalo presence before routing them to reps, so time is spent on reachable prospects.
For fraud & risk
Flag numbers with no Zalo footprint during onboarding or verification, adding a low-cost signal to your risk checks.
For data & RevOps
De-duplicate and validate CRM exports so dashboards are not skewed by dead or unreachable contacts.
For re-engagement
Separate numbers behind active Zalo accounts from dormant ones before a win-back campaign.
Where Zalo is used
Top markets by published penetration research. Each percentage is measured against the base its source states — internet users, survey respondents, population or smartphone owners — so read every figure with its source.
- Vietnam80%Decision Lab, The Connected Consumer Q4 2024 - messaging penetration rate
What the research says
Home-grown Zalo has been Vietnam's #1 messaging platform for 17 consecutive quarters, with 80% penetration in Q4 2024 versus 4% for WhatsApp.
Decision Lab, The Connected Consumer Q4 2024
How this Zalo check treats your list
Numbers are never messaged
A Zalo check is a passive lookup. The people on your list are never contacted, messaged or notified — verification leaves no trace on their side.
Priced per number, shown upfront
No subscription and no minimum. You see the per-number rate before you run anything, so a large list has no surprise cost.
You keep the results
Results come back as a downloadable report you own — import it straight into your CRM, dialer or ad audience. We do not resell or reuse your list.
FAQ
What does the Zalo checker return?
Depending on the tier you pick: Registration status; Active user status.
How much does Zalo checking cost?
From $0.0011 per number ($11.00 per 10,000 numbers), billed per checked number.
Will the numbers I check be notified?
No. Checks are passive lookups — no message or notification is sent to the checked numbers.
Can I check Zalo numbers in bulk?
Yes — upload your list in the psyke app, pick a tier, and download the results as a report when the bulk run finishes.
How widely is Zalo used?
In country-level research, some of its strongest measured markets are Vietnam at 80% (Decision Lab, The Connected Consumer Q4 2024 - messaging penetration rate).
Which countries use Zalo the most?
The strongest published figures in our source data: Vietnam (80% — Decision Lab, The Connected Consumer Q4 2024 - messaging penetration rate). Each percentage is measured against the base its source states — internet users, survey respondents, population or smartphone owners — so figures are only directly comparable within one source.