Mobile app publishers can set which categories of the ads offered in the apps come from the Admob account. The services offered within the Admob account include a list of all categories, and this list also includes ad come rates.
When you enter the admob account where your application is located, select which application you want to block ads. After selecting the application, when you press the 'Blocking Controls' page, all the categories appear. You can turn off unwanted or inappropriate content from these categories. If the ads you want to block are for the part with inappropriate content, you can close it from the Sensitive Category page.
If you want to block a URL, you will click the 'Advertiser Urls' page from the 'Blocking Controls' page and when you enter your url address you want to block, the url will appear. When you say block incoming url, you will block the ad url in your Admob account and you will not receive any advertisement from that advertiser.