costco.com
Domduck has read costco.com on 7 days across 5 sources, since 2 August 2026. The domain was registered in 1997. Its robots.txt blocks none of the 8 AI crawlers Domduck tracks.
Last checked .
blocked
What changed
7 days of readings- 10 October 2026 (2026-10-10)
- The certificate moved from DigiCert Inc to Certainly between 26 September 2026 and 10 October 2026.
- The certificate was renewed between 26 September 2026 and 10 October 2026 and is valid to 22 October 2026.
Popularity rank
72 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.costco.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 costco.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
- Certainly
- Valid
- Yes
- Expires
- 2026-10-22
- Protocol
- TLSv1.3
- Names covered
- 12
- A records
- 4
- AAAA records
- 0
- Mail exchangers
- 2
- Nameservers
- a1-116.akam.net, a14-67.akam.net, a28-66.akam.net, a5-64.akam.net, a6-64.akam.net, a9-66.akam.net
- DMARC policy
- reject
- Registered
- 1997-03-17
- Registrar
- CSC Corporate Domains, Inc.
- Registry status
- client transfer prohibited, server delete prohibited, server transfer prohibited, server update prohibited
How costco.com compares to other .com domains
Questions
- Does costco.com block GPTBot?
- No. costco.com's robots.txt does not disallow GPTBot, though it does not name the agent either.
- Does costco.com publish an llms.txt file?
- No. Domduck found no llms.txt at costco.com.
- When was costco.com registered?
- 17 March 1997, through CSC Corporate Domains, Inc..
- Who issues costco.com's certificate?
- Certainly.
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, 7 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 costco.com.