GoGuides Trust Record

Enter a domain to view its GoGuides Website Trust Record, including measured trust signals, canonical website URL, observation history, current trust state, trust record fingerprint, and crawl timing.

Current Trust Summary

This GoGuides Trust Record summarizes the current measured state for nlm.nih.gov.

Trust Status

Policy blocked
First recorded by GoGuides: 2026-01-12 00:45:14

Public Eligibility

This domain is not eligible for positive trust display or machine-readable trust use.

Policy Reason

mojibake or broken encoding
Code: mojibake_or_broken_encoding

Historical Grade

Not Available / Historical Rank 82

Crawl Freshness

Fresh
Last crawled 9 hours ago

Domain Provenance Record

19 measurements across 153 days

Stability Window

7 days

Trust Record

This domain is policy blocked. This Trust Record is shown for transparency and audit purposes only.

Policy blocked. Trust activation, badge publication, and positive machine-readable trust use are not available while this decision is active.

Canonical URL

https://nlm.nih.gov/

Matched URL

https://nlm.nih.gov/

AI Rank

Grade

Not Available

Domain Provenance Timeline

Independent GoGuides observations showing when this domain was first recorded, how long it has been observed, and when its recorded state changed.

Observed Web & Network State

Objective state captured by GoGuides during its domain observation. These fields describe what GoGuides observed and are separate from AI Rank or Grade.

HTTP Status

200

Observed Final URL

https://www.nlm.nih.gov/

Observed Public IP Addresses

130.14.16.110, 2607:f220:41e:1016::110

Observed Nameservers

lhcns1.nlm.nih.gov, lhcns2.nlm.nih.gov, ns.nih.gov, ns2.nih.gov, ns3.nih.gov

Robots Access

Allowed
allowed

Page Robots Directive

Not observed

TLS Certificate

CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1,O=DigiCert Inc,C=US
Valid 2026-02-26 00:00:00 to 2026-09-12 23:59:59

Observed Provenance States

1 stored state across 26 observations

Observed State Changes

Content: 0
Robots: 0
DNS: 0
TLS certificate: 0
Final URL: 0

Observed Evidence Details

These are objective observations recorded by the GoGuides crawler. They are separate from GoGuides AI Rank, Grade, or other interpretation.

Observation Type
Full Page Observation

Requested URL
https://nlm.nih.gov/

Final URL
https://www.nlm.nih.gov/

HTTP Status
200

Redirect Count
1

Content Type
text/html

Response Bytes
33,490

Canonical URL
Not observed

Observed Page Title
National Library of Medicine - National Institutes of Health

Robots Access
Allowed

Robots Reason
allowed

Meta Robots
Not observed

X-Robots-Tag
Not observed

Observed Public IP Address(es)
130.14.16.110, 2607:f220:41e:1016::110

Observed Nameservers
lhcns1.nlm.nih.gov, lhcns2.nlm.nih.gov, ns.nih.gov, ns2.nih.gov, ns3.nih.gov

TLS Certificate Issuer
CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1,O=DigiCert Inc,C=US

TLS Valid From
2026-02-26 00:00:00

TLS Valid Until
2026-09-12 23:59:59

First Observed
2026-08-09 00:10:41

Last Observed
2026-08-15 07:57:13

Identical-State Observations
26

▶ Show Cryptographic Evidence & SHA-256 Hashes ▼ Cryptographic Evidence & SHA-256 Hashes

                Title SHA-256

                7b0a842297f6447f4724038143ccd665869f1f0763095ea6435b4a427dd5067d            

                Content SHA-256

                d7ceaa42ce1bdfe483529fb8144bfba63012fb6148b140164270ca7abe0686a1            

                HTTP Body SHA-256

                07726c1e70952b5ba06b964f61d2182ecbbce52fcbdd2ebf0092eca0b33c097d            

                robots.txt SHA-256

                20c2103546b1780b87b40181394fca5d3845d6f4f580d8105bbd8c5cc2d48325            

                DNS State SHA-256

                a283675be15a51682c1fbec5dedd6ae192cec632f45a543aab4229e260e8b132            

                TLS Certificate SHA-256

                44a9c5c8c457a209bba909ee2089daae3882ab1b153b291790e3430ebe44fb64            

                Complete Provenance State SHA-256

                8745ff3bf1a3061201ae137d516d8a1264cb7143c0a0e1ac2a2065a9175fcbb5

View Machine-Readable Provenance JSON

First Seen by GoGuides

2026-01-12 00:45:14

Last Crawled by GoGuides

2026-08-15 07:57:13 (9 hours ago)

Last Record Refresh

2026-08-15 17:04:10 (just now)

Record Refresh Freshness

Fresh
Last refreshed just now

Stored Measurement Age

153 days

Trust Record Age

215 days ago

Stored Trust Measurements

Measurement Span

153 days across 19 stored measurements

Stability Window

7 days

Current Trust State Since

2026-08-08 07:47:25 (7 days ago)

Days Since Last Change

7 days

Rank/Algo State Changes

Trust Record Fingerprint (SHA-256)

9f94f25417baa94dd5692d3d25f28373490a30f7b847c3b86c992b9b41e716c8

Computed from: matched URL + rank + last crawled + algorithm version. This identifies the GoGuides trust record state; it is not domain-owner verification.

Provenance Observation History

This timeline shows when GoGuides recorded this trust state, including rank, crawl timing, algorithm version, and verification fingerprint.

Trust Favicon Not Available

This record is policy blocked and is shown for transparency only. GoGuides does not publish a positive trust favicon for this domain while this decision is active.

Related GoGuides AI Visibility & Trust Utilities

These GoGuides utilities work together: explain crawler activity, inspect AI visibility gaps, compare robots.txt with trust-layer signals, check verified text records, and activate a public Trust Signal when a domain is ready.

Why GoGuides Crawled My Site Are AI Bots Visiting My Site? Not Showing in ChatGPT? Is My Site Used by AI? Robots.txt vs Trust Layer Verified Text Search