An ad verification proxy lets you load your own campaigns from an IP address in the market you are targeting, so you see what a user in Tokyo or Seoul actually sees: the right creative, the right language, the right price and a landing page that does not redirect somewhere unexpected. If your team sits in Vietnam or Europe and runs ads into Japan and South Korea, your own browser shows you the wrong version of almost everything. This guide explains what to check, how to set up a dedicated proxy for it, and where a proxy is not the right tool.
Why geo-targeted ads look different from your desk
Ad platforms, publishers and your own website all make decisions based on the visitor's IP address. A campaign set to "Japan only" will simply not serve to an IP in Ho Chi Minh City. A landing page with geo-redirects may send a Korean visitor to /ko/ and everyone else to /en/. A tag manager may load a Japan-specific consent banner. None of that is visible unless the request comes from the right country.
Language and timezone settings matter too. Many sites choose the language from the Accept-Language header and show dates, currencies and opening hours from the browser's timezone. A Japanese IP with an English browser set to Vietnam time can still produce a mixed result. Proper verification means matching all three: IP country, browser language and timezone.
What to verify: a practical checklist
Before you open a browser, write down what "correct" looks like for each market. A short checklist keeps reviews consistent between team members.
- Creative: the Japanese or Korean version of the banner or video appears, with the right copy and no truncated text.
- Placement: the ad appears on the publishers or search results you expect, and not next to content your brand guidelines exclude.
- Landing page: the click lands on the localized page, with the right currency (JPY or KRW), local phone numbers and shipping information.
- Redirects: tracking redirects resolve cleanly, without loops, and end on an HTTPS page.
- Consent and tags: the cookie banner and analytics tags behave as your legal team specified for that market.
- Speed: the landing page loads at an acceptable pace from that region. A heavy page that feels fine from your office can feel slow from Seoul.
For search ads, add the keywords and the local search engines you care about. Rank tracking follows the same logic, and the local SEO rank tracking guide covers that workflow in more depth.
Choosing an ad verification proxy
For this job you want a stable, predictable IP. Rotating pools change address between requests, which makes it hard to reproduce what a colleague saw an hour earlier. A dedicated proxy keeps the same IP for the whole term and is assigned to one customer only, so its history is yours.
Cloudj sells dedicated IPv4 proxies in Japan and South Korea, alongside Vietnam, the United States, Singapore, Hong Kong and the United Kingdom. These are static ISP proxies: static IPs registered to an ISP and assigned to you alone. They are fast and stable, which suits repeated checks. Static residential ISP IPs, which come from home broadband and look like a regular home user, are only offered in the United States and Vietnam, so for Japan and Korea you will be using dedicated IPv4. That is fine for most verification work.
If you need background on how dedicated proxies compare with shared and rotating options, start with the dedicated proxy guide. Country-specific notes are in the Japan proxy and South Korea proxy articles. You can see all locations on the proxy overview page.
Setting up a verification browser step by step
- Order the IPs. In the Cloudj console choose Japan or South Korea, pick a quantity and a term of 1, 3, 6 or 12 months, and pay from your balance. Proxies are usually ready within a few minutes. One IP per market is enough for manual checks; a small team may want one per reviewer.
- Copy the credentials. Each proxy has a host, port, username and password shown in the console. Each view of the credentials is logged and you receive a notice, which is useful when several people share access.
- Pick the protocol. HTTP works for browsers out of the box. Switch to SOCKS5 in the console if your tool prefers it and the location supports it.
- Create a separate browser profile. Do not route your everyday browser through the proxy. Make a dedicated profile named after the market, for example "JP verification", so cookies and history from one country never leak into another.
- Match language and timezone. Set the profile language to Japanese or Korean and the system or browser timezone to
Asia/TokyoorAsia/Seoul. - Confirm the exit IP. Before checking any ad, visit an IP lookup page in the profile and confirm the country. A quick command-line test is just as good:
curl -x http://USERNAME:PASSWORD@HOST:PORT https://api.ipify.orgIf you would rather not keep passwords in browser settings, use the IP whitelist instead. You can add up to 20 addresses, such as your office IPs, and the whitelist then replaces password access for that order.
Running checks without distorting your campaigns
Verification should observe your campaigns, not change them. A few habits keep the data clean.
- Do not click your own paid ads to reach the landing page. Each click costs money and ad platforms treat repeated self-clicks as invalid traffic. Open the final URL directly, or use the platform's own preview tool.
- Keep impressions low. Repeatedly refreshing a search results page inflates impressions and can lower click-through rate figures.
- Exclude your proxy IPs from analytics where your tools allow it, so verification visits do not pollute conversion data.
- Record evidence. Save a screenshot with the date, IP country and URL for each check. That turns a vague "the Korean page looked wrong" into a ticket someone can fix.
Most ad platforms also offer preview and diagnosis tools that simulate a location without serving a real impression. Use them first; use the proxy for what they cannot show, such as the real landing page, redirects through third-party trackers and publisher placements.
Automating repeat checks
Once the manual checklist is stable, you can script the landing page part. A headless browser routed through the same proxy can load each localized URL daily and save screenshots for review. The Playwright and Puppeteer proxy guide shows how to pass proxy credentials per browser context, which lets one script check Japan and Korea in the same run. Keep automated runs gentle and respect the robots rules and terms of the sites you load.
When a proxy is not the answer
A proxy changes your IP, not your device. If a campaign targets mobile only, you also need a mobile user agent or a real device. If the ad platform targets by signed-in account data rather than location, a proxy will not reproduce what a specific audience sees. And if you need to verify at large scale across many publishers, a dedicated ad verification service may be better value than building it yourself. Proxies are a good fit for regular, hands-on checks by a marketing or QA team.
FAQ
Do I need a Japanese IP to see my Japan-only ads?
Yes, in most cases. Location targeting is based largely on IP address, so a campaign limited to Japan will not serve to a visitor outside it. Match the browser language and timezone as well.
Can I use one proxy for both Japan and Korea?
No. Each IP belongs to one country. Order one IP in Japan and one in South Korea and keep each in its own browser profile.
Will clicking my ad through a proxy hurt the campaign?
It can. Clicks cost money and repeated clicks from the same IP may be flagged as invalid. Visit the landing page URL directly instead.
Are static residential IPs available in Japan or Korea?
Not from Cloudj. Static residential ISP proxies are offered only in the United States and Vietnam. Japan and South Korea use dedicated IPv4 static ISP proxies.
Start checking your campaigns
Pick the markets you advertise in, order one dedicated IP for each in the console, and build a separate browser profile per country. Current prices per IP are listed on the pricing page, and the console shows the exact amount before you pay.