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81
Total
80
DNS
90
Email
65
Security
70
Network
100
Availability
Domainfast.ai
IPv43
IPv63
MX records1
StatusActive
Domain technical report

fast.ai—Making neural nets uncool again – fast.ai

fast.ai

Generated: 2026-08-10T20:56:42-05:00 · Cached result

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IPv43
IPv63
MX1
NS2

DiagnosticsMain findings and recommendations

✓
IPv4 (A)30 / 30 pts · Dns

3 IPv4 address(es) detected.

✓
IPv6 (AAAA)10 / 10 pts · Dns

3 IPv6 address(es) detected.

✓
Name server redundancy20 / 20 pts · Dns

2 NS record(s); 2 or more required.

✓
SOA record10 / 10 pts · Dns

Authoritative zone record.

!
DNSSEC chain0 / 15 pts · Dns

Both DS and DNSKEY are required.

!
CAA policy0 / 5 pts · Dns

Certificate authority restriction.

✓
DNS propagation10 / 10 pts · Dns

Agreement between public resolvers.

✓
MX records20 / 20 pts · Mail

1 MX record(s).

✓
SPF25 / 25 pts · Mail

SPF policy published.

✓
DMARC25 / 25 pts · Mail

DMARC policy published.

✓
DKIM20 / 20 pts · Mail

A DKIM selector was verified.

!
MTA-STS0 / 5 pts · Mail

Mail transport policy.

!
TLS-RPT0 / 5 pts · Mail

TLS reporting policy.

✓
Valid TLS certificate55 / 55 pts · Security

76 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

!
HTTP security headers0 / 35 pts · Security

0 of 9 evaluated headers detected.

!
PTR reverse DNS0 / 30 pts · Network

PTR not detected.

✓
IPv4 diversity35 / 35 pts · Network

Two or more IPv4 addresses receive full points.

✓
IPv6 connectivity35 / 35 pts · Network

AAAA availability.

✓
DNS resolution40 / 40 pts · Availability

At least one address family must resolve.

✓
HTTP response40 / 40 pts · Availability

HTTP/2 200

✓
HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

3 record(s)
104.26.2.19
104.26.3.19
172.67.69.159

AAAA

3 record(s)
2606:4700:20::681a:213
2606:4700:20::681a:313
2606:4700:20::ac43:459f

CNAME

0 record(s)
—

Not configured

MX

1 record(s)
1 smtp.google.com.

TXT

2 record(s)
"google-site-verification=GTRvd7IHODSRGWW4uvb-UjS6NqY8vlFNMYTmhtcbURE"
"v=spf1 a mx include:_spf.elasticemail.com include:spf.messagingengine.com include:amazonses.com ip4:107.170.249.202 include:_spf.google.com ~all"

NS

2 record(s)
roman.ns.cloudflare.com.
melissa.ns.cloudflare.com.

SOA

1 record(s)
melissa.ns.cloudflare.com. dns.cloudflare.com. 2410712542 10000 2400 604800 1800

CAA

0 record(s)
—

Not configured

DS

0 record(s)
—

Not configured

DNSKEY

0 record(s)
—

Not configured

RRSIG

0 record(s)
—

Not configured

NSEC

0 record(s)
—

Not configured

NSEC3

0 record(s)
—

Not configured

SRV

0 record(s)
—

Not configured

NAPTR

0 record(s)
—

Not configured

TLSA

0 record(s)
—

Not configured

SSHFP

0 record(s)
—

Not configured

SPF

Configured
v=spf1 a mx include:_spf.elasticemail.com include:spf.messagingengine.com include:amazonses.com ip4:107.170.249.202 include:_spf.google.com ~all

DMARC

Configured
v=DMARC1; p=none; pct=100; rua=mailto:re+skfjydly3fl@dmarc.postmarkapp.com; sp=none; aspf=r;

DKIM

Selector k1
k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDbNrX2cY/GUKIFx2G/1I00ftdAj713WP9AQ1xir85i89sA2guU0ta4UX1Xzm06XIU6iBP41VwmPwBGRNofhBVR+e6WHUoNyIR4Bn84LVcfZE20rmDeXQblIupNWBqLXM1Q+VieI/eZu/7k9/vOkLSaQQdml4Cv8lb3PcnluMVIhQIDAQAB;

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
fast.ai—Making neural nets uncool again – fast.ai
Description
Final URL
https://www.fast.ai/
HTTP status
206

HTTP

Status
HTTP/2 200
Final URL
https://www.fast.ai/
Version
3
Server
cloudflare
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Google Trust Services
CN
fast.ai
Valid from
2026-07-28T02:20:20-05:00
Valid until
2026-10-26T03:20:07-05:00
Days remaining
76
Protocol
TLSv1.3
Cipher
TLS_AES_256_GCM_SHA384

Security headers

0 active
—
HSTSNot detected
—
Content Security PolicyNot detected
—
X-Content-Type-OptionsNot detected
—
X-Frame-OptionsNot detected
—
Referrer PolicyNot detected
—
Permissions PolicyNot detected
—
Cross-Origin-Opener-PolicyNot detected
—
Cross-Origin-Embedder-PolicyNot detected
—
Cross-Origin-Resource-PolicyNot detected

DNS propagationComparison across public resolvers

Public resolver comparison

Consistent
✓
Consistent propagation

5 public resolvers queried.

ResolverServerResultLatency
Google
8.8.8.8
104.26.2.19, 104.26.3.19, 172.67.69.159
60,96 ms
Cloudflare
1.1.1.1
104.26.2.19, 104.26.3.19, 172.67.69.159
47,64 ms
Quad9
9.9.9.9
104.26.2.19, 104.26.3.19, 172.67.69.159
144,39 ms
OpenDNS
208.67.222.222
104.26.2.19, 104.26.3.19, 172.67.69.159
78,19 ms
AdGuard
94.140.14.14
104.26.2.19, 104.26.3.19, 172.67.69.159
431,76 ms

IP, geolocation and ASNAssociated network information

104.26.2.19

No data
success
No
country
region
city
asn
organization
isp

104.26.3.19

No data
success
No
country
region
city
asn
organization
isp

172.67.69.159

No data
success
No
country
region
city
asn
organization
isp

Visitor information

Visitor
ip
216.73.217.62
reverse
country
country_code
region
city
latitude
longitude
isp
organization
asn
timezone
browser
Other
os
Other
language
user_agent
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
is_bot
Yes
cloudflare
No

SMTPEmail port connectivity

smtp.google.com

Port 25: Closed/unreachable - 22.6 ms - 220 mx.google.com ESMTP 46e09a7af769-7f3a78b5cbcsi82420a34.30 - gsmtp
Port 465: Closed/unreachable - 4010.8 ms - 
Port 587: Closed/unreachable - 4020 ms -

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