How to Block Adult Websites on Your Network
Adult content reaches users through far more than dedicated adult sites: image search, social platforms, file hosts and AI tools all play a part. A block that works uses five layers, each covering what the one before it misses.
Why organisations block adult websites
For schools and libraries it is often a legal duty. For employers it is about a safe workplace and security. For families and the vendors who serve them, it is about children.
The age verification laws, such as the UK Online Safety Act duties in force since July 2025 and a growing number of US state laws, change often. Check the current rules where you operate.
Choose a tier: which categories to block
"Adult" is not one switch. These three tiers match the most common settings. Category names are from our 59 web filtering categories.
Strict
Primary schools, children's devices, parental control apps- Adult Block
- Lingerie/Swimsuits/Intimate Apparel Block
- Dating Block
- VPN / Proxy / Anonymizers Block
- AI tools with Adult Block
- SafeSearch Strict
Moderate
Secondary schools, libraries, most workplaces- Adult Block
- Lingerie/Swimsuits/Intimate Apparel Allow or warn
- Dating Block at work
- VPN / Proxy / Anonymizers Block
- AI tools with Adult Block
- SafeSearch Enforced
Minimal
Adult guest Wi-Fi, hotels, cafes- Adult Block
- Lingerie/Swimsuits/Intimate Apparel Allow
- Dating Allow
- VPN / Proxy / Anonymizers Allow
- AI tools with Adult Block
- SafeSearch Optional
Definitions are on the adult content category page, with the narrower nudity category and the dating category alongside.
Lock SafeSearch on search engines and video
Blocking adult domains does nothing about explicit thumbnails in image search results. Search engines offer "safe" versions that you can force at the DNS level, so users cannot switch them off.
| Service | Point the search hosts to | Effect |
|---|---|---|
| Google Search | forcesafesearch.google.com | SafeSearch on and locked for all Google search domains you map |
| Bing | strict.bing.com | Strict SafeSearch |
| YouTube | restrict.youtube.com or restrictmoderate.youtube.com | Strict or moderate Restricted Mode |
| DuckDuckGo | safe.duckduckgo.com | Safe search enforced |
How to apply it
DNS server or filter
- Create CNAME records or rewrite rules that map www.google.com and the country Google domains your users reach to the safe host.
- Do the same for Bing, YouTube and DuckDuckGo hosts.
- Many DNS filters have a single SafeSearch switch that does this for you.
Managed browsers
- In Google Admin, set SafeSearch and YouTube restricted mode in the Chrome browser settings for each organisational unit.
- For Edge and Chrome on Windows, use the matching policies through Intune.
- Lock the settings so users cannot change them.
Common SafeSearch mistakes
Search engines have other, less known hosts and some users try smaller search engines. Block the search engines you do not support, or force them through the same filter.
Blocking methods, step by step
Pick the methods that match your devices. The category data is the same across them, so the policy stays consistent from the router to the phone.
Router
- Set the router's DNS to a family or business filtering resolver.
- Turn on the router's adult content profile if it has one.
- Block outbound DNS to other resolvers where possible.
- Put children's devices on a separate profile if the router supports it.
DNS filter
- Block the Adult category and the other categories in your tier.
- Turn on SafeSearch enforcement.
- Block DNS over HTTPS hosts and the VPN / proxy category.
- Use roaming agents for laptops that leave the site.
Firewall or web gateway
- Block the vendor's adult and nudity categories in the web filter profile.
- Add an external dynamic list for categories the vendor does not split the same way.
- Enable SafeSearch enforcement if the firewall supports it with TLS inspection.
- Apply to every segment, including guest Wi-Fi.
Intune
- Push a web filter agent or DNS profile that blocks the adult content categories for the right device groups.
- Check that the filter covers every browser on the device, not only Edge.
- Add custom block entries for any extra domains.
- Push browser SafeSearch policies through the settings catalog.
Google Admin
- Under Devices, Chrome, Settings, URL blocking, add any domains your network filter does not cover.
- Set SafeSearch and YouTube restricted mode for students.
- Block incognito mode for student units so history-based monitoring works.
- Use a network or DNS filter for categories, since URL blocking is list-only.
MDM and phone controls
- On iPhone and iPad, Screen Time content restrictions include a setting to limit adult websites; MDM can set a web content filter.
- On Android, Family Link and Android Enterprise policies can restrict sites and apps.
- Push a DNS profile so mobile data is filtered too.
- Restrict app installs to approved apps on children's and school devices.
Firewall category names differ by vendor.
Policy by setting
The same organisation may need different rules on different networks. This table shows common choices; adjust it to your own legal advice and acceptable use policy.
| Setting | Tier | Exceptions | Notes |
|---|---|---|---|
| K-12 school, student devices | Strict | None for students | CIPA applies for E-Rate funded schools; apply on take-home devices too |
| K-12 school, staff devices | Moderate | Per request for teaching needs | Staff devices often carry student data |
| Public library, children's terminals | Strict | None | CIPA for E-Rate funded libraries |
| Public library, adult terminals | Moderate | Unblocking for adults with a lawful purpose | CIPA allows an authorised person to disable the filter for adults doing bona fide research or other lawful purposes |
| Office network | Moderate | Security and investigation teams | Document the exception and log it |
| Guest Wi-Fi | Minimal | None | Keep the Adult block even when other categories are open |
| Family home | Strict for children's profiles | Adult profiles separate | Use per-device profiles where the router or filter supports them |
When the logs show repeated attempts
A filter blocks the page, but the log tells you something too. Decide in advance how you handle repeated hits in the Adult category, because it is a sensitive conversation.
Where adult content slips past a basic block
Dedicated adult sites are the easy part. These are the routes that a single category rule misses, with the control that closes each one. Most gaps found in audits come from this list, not from the adult sites themselves.
Apps vs browser
Most adult content is reached in a browser, but apps still matter, especially social and messaging apps on children's phones. Treat the two as separate tests in your rollout.
Browser
- Category filter and SafeSearch both apply
- Block page tells the user why
- Incognito mode does not bypass a DNS or firewall filter
- Off-site laptops need an agent or browser policy
Apps
- On your Wi-Fi, the DNS or firewall rule applies to app traffic too
- On mobile data, only device controls apply
- Social and messaging apps need their own safety settings
- App store age ratings help on family devices
How to test without viewing adult content
Admins should never need to open explicit material to check a filter. These steps confirm the block safely, and leave a record you can keep.
- Look up domains from your logs with the domain category lookup to confirm they carry the Adult category, instead of visiting them.
- Use the test or demo page many filter products offer to confirm the block page appears.
- Run a neutral image search and check that SafeSearch shows as locked and cannot be changed.
- Run a DNS query for a known-blocked domain from a client; check that the answer is your block address.
- Switch on a consumer VPN as a test user; it should fail to connect.
- Review filter reports for the Adult category to confirm hits are logged with device and user.
- Check that health, sex education and support sites still load, so the rule is not too broad.
Over-blocking is a real cost. Health information, LGBTQ+ support services, art and sex education should stay reachable in most settings. Good category data keeps them in Health & Medicine or Education/Reference, not Adult.
Rollout checklist for MSPs and IT teams
Use this list when you set up a new site or a new customer. It keeps the setup the same everywhere, which makes support and audits much easier.
Before go-live
- Agree the tier for each network and user group in writing
- Decide who approves exceptions and how they are logged
- Write the block page text and helpdesk answer
- Point DHCP DNS at the filter and block other resolvers
- Turn on SafeSearch enforcement
- Block VPN, proxy and encrypted DNS routes
After go-live
- Run the safe test steps above and save the results
- Check health and education sites still load
- Enrol laptops and phones in the device layer
- Review the Adult category report after one week
- Re-test after firmware or policy changes
- Review tiers once a year or when the law changes
MSPs who run this for many customers can find more on web filtering for MSPs, and schools on K-12 web filtering.
Category-based blocking with our database
Vendors of filters, firewalls, DNS services and parental control apps license our categories so their customers get a current adult content block without lists. The data runs inside their own systems, including air-gapped ones.
| Need | How the data helps |
|---|---|
| Keep up with new adult domains | Daily delta files; new domains rechecked after a week and a month as content is added |
| Avoid blocking health and education | Primary category reflects what the site is; Adult only where it fits |
| Different tiers per customer | Separate Adult, Lingerie/Swimsuits/Intimate Apparel and Dating categories |
| Schools under CIPA | Validation reports with measured accuracy of the CIPA categories for licence holders |
| Fit your product | CSV, Parquet or JSON; exports such as RPZ, EDL and hosts; lookup API |
See how app makers use it in parental control category data, how libraries apply it on library web filtering, and the formats on blocklist formats.
Frequently asked questions
What is the most effective way to block adult websites?
A category filter at the DNS or firewall level, plus enforced SafeSearch, plus device policies for phones and laptops that leave the network. No single layer is enough.
How do I force SafeSearch on my network?
Map search engines to their safe versions in DNS: forcesafesearch.google.com, strict.bing.com, restrict.youtube.com or restrictmoderate.youtube.com, and safe.duckduckgo.com. Managed browsers can also enforce it by policy.
How can I test an adult content block without visiting adult sites?
Check domain categories with a lookup tool, use your filter's test page, confirm SafeSearch is locked with a neutral search, and review the logs.
Do schools have to block adult websites?
In the US, E-Rate funded schools and libraries must use a technology protection measure under CIPA that blocks or filters images that are obscene, child sexual abuse material or harmful to minors on computers used by minors.
Which categories should I block besides Adult?
Strict policies also block Lingerie/Swimsuits/Intimate Apparel for children, Dating, and VPN / Proxy / Anonymizers so the block cannot be bypassed.
Will blocking adult content block sex education and health sites?
It should not. Good category data puts health, sex education and support services in Health & Medicine or Education/Reference. If one is blocked, check it with a lookup and add an allow rule.
Can I block adult content on a phone that uses mobile data?
Only with device controls: Screen Time or Family Link on family phones, or an MDM profile with a web filter or DNS setting on managed phones.
Does private browsing get around the filter?
No. Private or incognito windows still use the network's DNS and firewall. They only hide local history.
Give your customers a current adult content block
License 120 million categorized domains with daily updates for your filter, firewall, DNS service or parental control app.
License the databaseGoogle, Chrome, YouTube, SafeSearch and Family Link are trademarks of Google LLC. Microsoft, Bing, Intune and Edge are trademarks of Microsoft Corporation. DuckDuckGo is a trademark of Duck Duck Go, Inc. iPhone, iPad and Screen Time are trademarks of Apple Inc.
These names are used here only to identify the products discussed. Web Filtering Database is not affiliated with, sponsored or endorsed by any of these companies.