harpercollins.com
Domduck has read harpercollins.com on 5 days across 5 sources, since 2 August 2026. The domain was registered in 1994. Its robots.txt blocks none of the 8 AI crawlers Domduck tracks.
Last checked .
Charts appear once there are seven days of readings.
blocked
What changed
5 days of readingsNothing has changed since the first reading on 2 August 2026.
Popularity rank
74 days, lower is betterPosition in the Tranco list, a research ranking of the million most popular domains averaged over thirty days so a single day’s traffic spike cannot move it.
AI crawler policy
Redirects to www.harpercollins.com · No llms.txtNo ChatGPT browsing or training
No ChatGPT search surface
No Claude retrieval
No Perplexity citation
Out of Gemini and AI Overviews grounding, Search ranking unaffected
Out of Apple Intelligence training
Out of most open training corpora
Out of TikTok and Doubao
Read from harpercollins.com/robots.txt. “Not named” means the file says nothing about that agent, which is not the same as allowing it: a catch-all rule added later blocks it without anyone deciding to.
What the domain itself says
read directly, not from a vendor- Issuer
- DigiCert Inc
- Valid
- Yes
- Expires
- 2026-12-06
- Protocol
- TLSv1.3
- Names covered
- 2
- A records
- 1
- AAAA records
- 0
- Mail exchangers
- 2
- Nameservers
- dbru.br.ns.els-gms.att.net, dmtu.mt.ns.els-gms.att.net
- DMARC policy
- reject
- Registered
- 1994-04-13
- Registrar
- MarkMonitor Inc.
- Registry status
- client delete prohibited, client transfer prohibited, client update prohibited
How harpercollins.com compares to other .com domains
Questions
- Does harpercollins.com block GPTBot?
- No. harpercollins.com's robots.txt does not disallow GPTBot, though it does not name the agent either.
- Does harpercollins.com publish an llms.txt file?
- No. Domduck found no llms.txt at harpercollins.com.
- When was harpercollins.com registered?
- 13 April 1994, through MarkMonitor Inc..
- Who issues harpercollins.com's certificate?
- DigiCert Inc.
How this page is made
Every number on this page is a measurement Domduck took itself or read from a public source, on a stated date. Nothing here is written by a language model. Where a value has not changed, no sentence is generated about it.
First reading . 5 sources, 5 days with at least one reading. The popularity rank comes from the Tranco list; the registration record from RDAP, which ICANN requires registries to publish. The certificate, the DNS records and the crawler policy are read by Domduck directly from harpercollins.com.