gcdn.co: what it tells AI crawlers

On 26 October 2026, gcdn.co's robots.txt fully blocked GPTBot, OAI-SearchBot, ClaudeBot, Claude-SearchBot, Google-Extended, PerplexityBot and CCBot.

Last verified 2026-10-26 21:13 UTC (daily run of 2026-10-26). Proof for that day.

Panel
top 1k (Tranco)
robots.txt
ok (HTTP 200) · http://gcdn.co/robots.txt
unchanged since 2026-10-26 · sha256 30b9ad16dcd028c2… · view as recorded
The * group
blocks applies to every agent without its own group

Per AI bot, 2026-10-26

User agentVerdictHow
GPTBotblocksthrough the * group
OAI-SearchBotblocksthrough the * group
ChatGPT-Userblocksthrough the * group
ClaudeBotblocksthrough the * group
Claude-SearchBotblocksthrough the * group
Claude-Userblocksthrough the * group
PerplexityBotblocksthrough the * group
Perplexity-Userblocksthrough the * group
Googlebotblocksthrough the * group
Google-Extendedblocksthrough the * group
Applebot-Extendedblocksthrough the * group
CCBotblocksthrough the * group
Bytespiderblocksthrough the * group
Meta-ExternalAgentblocksthrough the * group
Amazonbotblocksthrough the * group

Other signals

Publishes /llms.txtnot observed
Publishes /ai.txtnot observed
Publishes /.well-known/tdmrep.jsonnot observed
Reserves TDM rights (TDMRep file, header or meta)not observed
Declares Content Signals (robots.txt or header)not observed
Says ai-train=no in a Content Signalnot observed
Points to an RSL licence (robots.txt License line or Link header)not observed
Answers with an x402 payment offer (lower bound: only the homepage is probed)not observed
Answers HTTP 402 Payment Required (lower bound: only the homepage is probed)not observed
Sends noai / noimageai directivesnot observed
Refused our fetcher (403 / challenge)no

robots.txt versions

FromThroughStateVersion
2026-10-262026-10-27ok 20030b9ad16dcd0

Timeline of changes

DateWhat changed
No changes since the first observation (2026-10-26).

Reconstructed history (Common Crawl)

From Common Crawl's robots.txt captures: what CCBot was served, one crawl per quarter. A separate series from the daily observations above; a 403 here means Common Crawl was refused, not this ledger.

CrawlHostStateGPTBotOAI-SearchBotChatGPT-UserClaudeBotClaude-SearchBotClaude-UserPerplexityBot
2024-09-16 CC-MAIN-2024-38gcdn.cook viewblocksblocksunknownblocksblocksunknownblocks
2020-09-28 CC-MAIN-2020-40gcdn.coredirect-onlyunknownunknownunknownunknownunknownunknownunknown
2018-09-24 CC-MAIN-2018-39gcdn.coredirect-onlyunknownunknownunknownunknownunknownunknownunknown
2017-09-25 CC-MAIN-2017-39gcdn.coredirect-onlyunknownunknownunknownunknownunknownunknownunknown

Evidence

Every daily observation of gcdn.co is a leaf in that day's Merkle tree. Proof of the robots.txt line for 2026-10-26: audit path (JSON), day root and OpenTimestamps proof (complete (bitcoin block 973294)).

API: https://infrarabbit.com/crawlers/api/v1/policy/gcdn.co