Does isc.org block AI crawlers?
Open to AI crawlers
isc.org doesn't block any of the major AI crawlers we track in its robots.txt.
Checked from isc.org/robots.txt. Robots rules change; the live file is the source of truth.
- AI crawlers blocked
- 0 of 12
- AI bots named in robots.txt
- 0
- llms.txt
- Not found
- Popularity
- Tranco top 5,000 (#3,291)
Can AI assistants cite isc.org?
- ChatGPT search: its search crawlers may read the site
- Claude: its search crawlers may read the site
- Perplexity: its search crawlers may read the site
isc.org doesn't opt out of AI model training through robots.txt. Training crawlers and answer crawlers are separate: blocking training doesn't by itself remove a site from AI answers.
AI crawler access, bot by bot
| Crawler | Used for | Status on isc.org |
|---|---|---|
| GPTBotOpenAI | AI training | Some paths restricted |
| OAI-SearchBotOpenAI | AI answers | Some paths restricted |
| ChatGPT-UserOpenAI | AI answers | Some paths restricted |
| ClaudeBotAnthropic | AI training | Some paths restricted |
| Claude-SearchBotAnthropic | AI answers | Some paths restricted |
| Claude-UserAnthropic | AI answers | Some paths restricted |
| PerplexityBotPerplexity | AI answers | Some paths restricted |
| Google-ExtendedGoogle | AI training | Some paths restricted |
| Applebot-ExtendedApple | AI training | Some paths restricted |
| CCBotCommon Crawl | AI training | Some paths restricted |
| BytespiderByteDance | AI training | Some paths restricted |
| Meta-ExternalAgentMeta | AI training | Some paths restricted |
How isc.org compares
- 19% of the 1,278 popular sites we checked block GPTBot; isc.org does not.
- 18% of the 1,278 popular sites we checked block ClaudeBot; isc.org does not.
- 14% of the 1,278 popular sites we checked block PerplexityBot; isc.org does not.
- Among 168 sites of similar popularity, 25% block at least one AI crawler.
The robots.txt rules that apply to AI crawlers
User-agent: * Disallow: /thankyou-contact/
Excerpt: only groups for all user-agents (*) or named AI crawlers, up to 40 rules per group.
Sites with a similar AI policy
Does isc.org block GPTBot?
No. As of Oct 2, 2026, isc.org's robots.txt doesn't block GPTBot, though some paths are restricted for all crawlers.
Can ChatGPT search show results from isc.org?
Its robots.txt doesn't block OAI-SearchBot or ChatGPT-User, so ChatGPT's search crawlers may read it. Whether pages are actually shown depends on ChatGPT.
Does isc.org have an llms.txt file?
We didn't find a valid llms.txt at isc.org/llms.txt when we checked.
Data: isc.org's public robots.txt and llms.txt, fetched by AskableHQ. Popularity rank from the Tranco list (ID Y83YG). Methodology.