School web filter check: how is this website categorized?
Enter any domain to see how it is classified across our database of 120 million categorized domains, and where it lands against CIPA's blocking requirements, your district policy tier, and instructional-time rules.
Checking classification…
Where it sits in a typical district policy
Categories found
What the result means for a school
Every check returns the web filtering categories a domain carries, then places the site in one of four tiers. The tier is the most restrictive one among its categories, so one sensitive category is enough to move a site up.
CIPA-Mandated Block
The domain carries a category in the core block set schools use to meet CIPA, such as Adult. Districts commonly group neighbouring categories like Gambling or Weapons into the same set.
For students: blocked on every school network and device.
District Policy Block
Not named in the statute, but routinely blocked as part of an internet safety policy. Proxy and VPN tools are the key example, since they can be used to get around the filter.
For students: usually blocked, by local decision.
Instructional-Time Restriction
Social networks, games, streaming and AI tools sit here. Many schools allow them for some grades or classes, or outside lesson time, rather than blocking them for everyone.
For students: limited by grade, class or schedule.
Permitted / Educational
Reference, science, news, health and government sites. Blocking them by accident is a common complaint from teachers and gets in the way of research.
For students: should normally stay open.
Several categories per site
A domain can carry more than one category, ranked by how much of the site each one describes. Large platforms often have three or more.
The three statutory pillars
The pillars show which part of the CIPA wording a result touches. The statute names visual depictions that are obscene, child pornography, or harmful to minors.
"Not yet classified"
Very new or very small domains may not be in the results yet. New domains are added daily and checked again after a week and a month.
Which website categories are CIPA-relevant?
Out of 58 web filtering categories, twelve come up most often when a school builds its CIPA block set. The edge colour shows which tier this checker places each one in.
The category closest to the statute: explicit and pornographic sites. The anchor of every CIPA block set.
Revealing imagery. Some general retailers also carry it, so review it with care before blocking.
Graphic violence and gore. Often treated as harmful to minors in district policy.
Sale and promotion of firearms and other weapons. Commonly blocked for students.
Sites promoting hostility against groups. Often blocked, while history and civics content stays open.
Sale or promotion of illegal drugs. Health and prevention resources belong elsewhere.
Betting, casinos and lotteries. Illegal for minors in most places, so almost always blocked.
Tools that hide traffic from the filter. Blocking them keeps every other rule working.
Sale and promotion of alcohol. Usually blocked for younger grades at least.
Tobacco and vaping products. A frequent addition to student policies.
Dating and hook-up services. Not suitable for minors and rarely needed at school.
Peer-to-peer and torrent sites. A copyright, bandwidth and security concern.
How to read a site with several categories
Big platforms are rarely one thing. A ranked list of categories helps you decide whether to block the whole domain or handle it another way.
Example: a general video platform
Illustration only. Look the real domain up above to see its current categories.
What a district usually does with it
- Places the site in the instructional-time tier, not the mandated tier.
- Opens it for staff and older students, and limits it for younger grades.
- Turns on restricted or safe modes where the platform offers them.
- Keeps the decision in writing, so it can be explained to parents.
More on this in our guide to video and streaming filtering in schools and social media filtering for schools.
Turning a category result into a rule by grade band
Most districts do not run one policy for everyone. A common pattern is to start strict for the youngest students and open up gradually, with staff getting the widest access.
| Tier from the check | Elementary | Middle school | High school | Staff |
|---|---|---|---|---|
| CIPA-Mandated Block | Blocked | Blocked | Blocked | Adult content stays blocked on school networks; other categories by local policy |
| District Policy Block | Blocked | Blocked | Mostly blocked | Case by case, for example remote access for IT |
| Instructional-Time Restriction | Mostly blocked | Selected sites allowed | Allowed with limits or schedules | Usually allowed |
| Permitted / Educational | Allowed | Allowed | Allowed | Allowed |
A common starting pattern, not a legal requirement. Adjust it to your internet safety policy and community.
Broad coverage
The data behind this check covers 120 million categorized domains. The 20 million most visited cover 99.99% of web traffic.
New sites every day
About 300,000 newly registered domains are categorized each day. That matters for proxy mirrors and copycat game sites that appear overnight.
Regular refresh
Established domains are refreshed monthly, and accuracy is measured with regular manual validations.
What to do if a site seems wrongly blocked or allowed
Teachers will report sites that are blocked when they need them, and sometimes sites that should not be open. A short, repeatable process keeps those reports from piling up.
Check the category here
Look the domain up with this tool. Note its categories and tier, so you know whether the filter acted on a category or on a custom rule.
Compare with your filter
Open your filter's own lookup or logs for the same domain. Different products use different category lists, so results can differ.
Fix it locally first
Add the site to your allow list or block list for the right group. That takes effect at once and does not depend on anyone else.
Report it to your vendor
If the category itself looks wrong, send your filter vendor the domain and the reason. Vendors review reports on their own schedule.
Tell us if our result looks wrong
You can send a domain through our contact page. We review reports as part of regular validation, without a set timeline.
Record the decision
Write down the site, the group, the change and who approved it. A simple log answers parent and board questions later.
| Situation | Likely cause | Quick local action |
|---|---|---|
| Teacher's research site is blocked | Site carries a sensitive secondary category | Allow the domain for staff, or for the grade that needs it |
| A game site opens for students | Gaming not blocked for that group, or a new domain | Block the domain and check your gaming setting per grade |
| Students reach a proxy site | VPN / Proxy category off, or a fresh mirror domain | Turn on the proxy category and add the domain to your block list |
| Results here and in your filter differ | Different category lists or update timing | Follow your own filter for enforcement, and use this check as a second opinion |
How to test your school web filter
A lookup tells you how a site is categorized. A test tells you whether your filter really enforces your policy on every network and device students use. Run one at the start of each school year, after any major filter change, and whenever a new device type is rolled out.
A simple test round
- Pick a short list of domains for each tier, using this checker to confirm their categories.
- Try them from a student account on the school network.
- Repeat on a take-home device on a home connection.
- Try a known proxy site, to make sure the filter cannot be bypassed easily.
- Repeat with a staff account and compare the results.
- Save the results with a date for your CIPA records.
Where to go next
Our step-by-step school web filter test covers test domains, device types and how to record results.
For take-home devices, read how to enforce CIPA on off-campus student devices.
To keep evidence in one place, work through the CIPA compliance checklist.
Who this school web filter check is for
The same lookup answers different questions depending on who is asking.
District IT staff
Explain a block to a teacher, or check a domain before adding it to an allow list.
Librarians
See why a patron's site was filtered before deciding on an adult unblock.
Teachers
Check a site before planning a lesson around it, and ask IT with facts in hand.
Edtech vendors
See how the category data behaves before licensing it for your own product.
School web filter check: common questions
Short answers about the checker and what it can and cannot tell you.
Does this tool tell me whether a site is blocked at my school?
No. It shows how the site is categorized and how districts commonly treat those categories. Whether it is blocked depends on your own filter and policy settings.
Why does a site show more than one category?
Many sites cover several topics. Categories are ranked by how much of the site they describe, and the tier shown is the most restrictive among them.
Is a site in the mandated tier illegal for schools to allow?
The tier means the site carries a category schools usually block to meet CIPA. CIPA itself refers to visual depictions that are obscene, child pornography or harmful to minors on computers used by minors. Your policy and counsel decide the exact line.
Why does my filter show a different category?
Each filter vendor keeps its own category list and update schedule. Use your filter's result for enforcement and this check as an independent second view.
A site says "not yet classified". What does that mean?
The domain is not in the results yet, often because it is very new or has little content. New domains are categorized daily and checked again as they add content.
Can I check many domains at once?
This page checks one domain at a time and is rate-limited. Bulk use is what the licensed database and its lookup API are for.
Are AI chatbots and AI writing tools covered?
Yes. AI services fall in the AI / LLM Tools category, which this checker places in the instructional-time tier. A separate AI tools set covers more than 11,800 AI-tool domains in 18 categories, updated daily, for schools that want finer control over essay writers, image generators and similar tools.
Which categories should an elementary school start with?
Most start with the CIPA-relevant set shown above, plus proxy tools, then add games, social networks and streaming for younger grades. Open up from there for older students. Review the list each year with teachers, since the sites students use change quickly.
Can you change a category I think is wrong?
You can send us the domain and your reason. Reports feed into our regular validation work, but we do not promise a change or a timeline. Your own allow and block lists are the fastest fix.
Questions about filtering in your district?
Tell us how many schools and devices you manage. We will explain how category filtering could support your CIPA policy, on campus and on take-home devices.
YouTube, Discord, Khan Academy, Roblox and Reddit are trademarks of their respective owners. They are used here only to identify the example domains. CIPAWebFiltering.com is not affiliated with, sponsored or endorsed by them.