cdc.gov

Domduck has read cdc.gov on 6 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 .

Charts appear once there are seven days of readings.

AI crawler policycdc.gov
0/8AI crawlers
blocked
Blocked 0.0%Allowed by name 0.0%Not named 100.0%
No robots.txt is served, so nothing is disallowed and every crawler is welcome.
Popularity rank#338Tranco
Age28yget.gov
Certificate172dDigiCert Inc
AI crawlers0/8none blocked
Record6dsince 2026-08-02

What changed

6 days of readings
  1. 28 September 2026 (2026-09-28)
    • The catch-all Disallow was removed between 14 September 2026 and 28 September 2026.
    • robots.txt started redirecting to www.cdc.gov between 14 September 2026 and 28 September 2026.
    • robots.txt started returning HTTP 301 between 14 September 2026 and 28 September 2026, from 304.
  2. 14 September 2026 (2026-09-14)
    • The certificate was renewed between 31 August 2026 and 14 September 2026 and is valid to 19 March 2027.
  3. 31 August 2026 (2026-08-31)
    • DNSSEC was enabled between 17 August 2026 and 31 August 2026.
  4. 17 August 2026 (2026-08-17)
    • robots.txt started returning HTTP 304 between 3 August 2026 and 17 August 2026, from 200.

Popularity rank

72 days, lower is better
cdc.gov popularity rank#338 today
2026-08-02338 – 3382026-10-12
The axis is flipped, so a rise on this chart is a rise in the list.

Position 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

No robots.txt served · Redirects to www.cdc.gov · No llms.txt
Blocked 0.0%Allowed by name 0.0%Not named 100.0%
GPTBotOpenAI
Not named

No ChatGPT browsing or training

OAI-SearchBotOpenAI
Not named

No ChatGPT search surface

ClaudeBotAnthropic
Not named

No Claude retrieval

PerplexityBotPerplexity
Not named

No Perplexity citation

Google-ExtendedGoogle
Not named

Out of Gemini and AI Overviews grounding, Search ranking unaffected

Applebot-ExtendedApple
Not named

Out of Apple Intelligence training

CCBotCommon Crawl
Not named

Out of most open training corpora

BytespiderByteDance
Not named

Out of TikTok and Doubao

Read from cdc.gov/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
Certificate172d left
Issuer
DigiCert Inc
Valid
Yes
Expires
2027-03-19
Protocol
TLSv1.3
Names covered
2
DNSDNSSEC validated
A records
2
AAAA records
2
Mail exchangers
4
Nameservers
a1-43.akam.net, a2-64.akam.net, a28-65.akam.net, a5-66.akam.net, a8-67.akam.net, a9-64.akam.net
DMARC policy
reject
Registration28 years old
Registered
1997-10-02
Registrar
get.gov
Registry status
server transfer prohibited

How cdc.gov compares to other .gov domains

This domaincdc.gov
0of 8 crawlers blocked
Median .gov107 domains
0of 8 crawlers blocked

Questions

Does cdc.gov block GPTBot?
No. cdc.gov's robots.txt does not disallow GPTBot, though it does not name the agent either.
Does cdc.gov publish an llms.txt file?
No. Domduck found no llms.txt at cdc.gov.
When was cdc.gov registered?
2 October 1997, through get.gov.
Who issues cdc.gov'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.

What the collectors have read · Request removal

First reading . 5 sources, 6 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 cdc.gov.