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84
Total
70
DNS
90
Email
73
Security
100
Network
100
Availability
Domainstackblitz.com
IPv44
IPv68
MX records5
StatusActive
Domain technical report

StackBlitz | Instant Dev Environments | Click. Code. Done.

stackblitz.com

StackBlitz is the collaborative browser-based IDE for web developers. StackBlitz eliminates time-consuming local configuration and lets developers spend more time building.

Generated: 2026-08-10T22:50:24-05:00 · Cached result

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IPv44
IPv68
MX5
NS2

DiagnosticsMain findings and recommendations

✓
IPv4 (A)30 / 30 pts · Dns

4 IPv4 address(es) detected.

✓
IPv6 (AAAA)10 / 10 pts · Dns

8 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 propagation0 / 10 pts · Dns

Agreement between public resolvers.

✓
MX records20 / 20 pts · Mail

5 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

51 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

i
HTTP security headers8 / 35 pts · Security

2 of 9 evaluated headers detected.

✓
PTR reverse DNS30 / 30 pts · Network

PTR: server-18-154-185-26.ord58.r.cloudfront.net

✓
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

4 record(s)
18.154.185.26
18.154.185.58
18.154.185.68
18.154.185.57

AAAA

8 record(s)
2600:9000:2507:7800:2:496a:a40:93a1
2600:9000:2507:6a00:2:496a:a40:93a1
2600:9000:2507:f800:2:496a:a40:93a1
2600:9000:2507:ae00:2:496a:a40:93a1
2600:9000:2507:4600:2:496a:a40:93a1
2600:9000:2507:c600:2:496a:a40:93a1
2600:9000:2507:8600:2:496a:a40:93a1
2600:9000:2507:be00:2:496a:a40:93a1

CNAME

0 record(s)
—

Not configured

MX

5 record(s)
5 alt2.aspmx.l.google.com.
10 alt3.aspmx.l.google.com.
10 alt4.aspmx.l.google.com.
1 aspmx.l.google.com.
5 alt1.aspmx.l.google.com.

TXT

14 record(s)
"anthropic-domain-verification-ttvd3n=ie5Kz2xrIXq2hJIqF5iGuOafr"
"MS=ms20645993"
"apple-domain-verification=lFvLRAX0ur6PMWmZ"
"google-site-verification=iX9WVLD1JAY0oz2VQ_TJpq-6a96oLTsmOe9fT3VZcDI"
"google-site-verification=t1_8D5FpDjchbYttkpmwVnwkQp2Nuhe8IsFMHBfFHZE"
"v=spf1 include:_spf.google.com include:45403856.spf03.hubspotemail.net ~all"
"rippling-domain-verification=60fa1b66fe1eeea1"
"google-site-verification=GyPQ23RIjQZkl6LuIot4wF0NCv2J2WCWC2Xr_zqHYQc"
"notion-domain-verification=ItdlGu4Z6gUWv14IC27chcFlKb3Bvdef8CcCH85vt9i"
"zapier-domain-verification-challenge=d60f92ec-887f-488e-8cd9-9cfbfb1dc472"
"slack-domain-verification=DktTeTheAJSqnK3mnP79FLbn71dbgVjdE6Ra8v6o"
"openai-domain-verification=dv-GnPiRQKUUGBUh5vx9PV8noNk"
"1password-site-verification=TQHYLJIHFZB2HLJYOYQLTBAD6Y"
"mixpanel-domain-verify=a33ca37b-4c22-431e-bb7d-09233db76c1f"

NS

2 record(s)
igor.ns.cloudflare.com.
zoe.ns.cloudflare.com.

SOA

1 record(s)
igor.ns.cloudflare.com. dns.cloudflare.com. 2410044086 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 include:_spf.google.com include:45403856.spf03.hubspotemail.net ~all

DMARC

Configured
v=DMARC1; p=none; rua=mailto:2324890eb4bf4916962f2e774af56822@dmarc-reports.cloudflare.net

DKIM

Selector mail
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAnQAUjclb+1rUyf+3R5lYdRXw1/uHWtIP3bCwxluKjRHbd0JdAUnZhlFKdF5UQdOzhNBggGY7PsRn5Jl5bqqe87M98La/MvcuQlOVgDCvLNKx67RSBZpT3hQqaDyrgCfzLUrcr8MxHsIbtjOXFG/Q7khPIzqnOrmG/Isl4ZZkZyqmfwqbLXc9qDH9O7WqNMO11+WBX4vSIqJsjTd59gr47ML9QeDAa/w3mkn5NJTuvGDe+1G+UdqcZ/7o5RnDIN/aLmmJuF900L+o7a1KsifBvNWsCeleTMBSYXhAu4aovlK3AXgop1Gsq3OBXauh8scBDPoqk4Me/cW6UePceW11kQIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
StackBlitz | Instant Dev Environments | Click. Code. Done.
Description
StackBlitz is the collaborative browser-based IDE for web developers. StackBlitz eliminates time-consuming local configuration and lets developers spend more time building.
Final URL
https://stackblitz.com/
HTTP status
200

HTTP

Status
HTTP/2 200
Final URL
https://stackblitz.com/
Version
3
Server
cloudflare
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Amazon
CN
stackblitz.com
Valid from
2026-03-17T19:00:00-05:00
Valid until
2026-10-01T18:59:59-05:00
Days remaining
51
Protocol
TLSv1.3
Cipher
TLS_AES_128_GCM_SHA256

Security headers

2 active
—
HSTSNot detected
—
Content Security PolicyNot detected
✓
X-Content-Type-OptionsImplemented
—
X-Frame-OptionsNot detected
✓
Referrer PolicyImplemented
—
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

Review
!
Differences detected

5 public resolvers queried.

ResolverServerResultLatency
Google
8.8.8.8
18.154.185.26, 18.154.185.57, 18.154.185.58, 18.154.185.68
51,18 ms
Cloudflare
1.1.1.1
18.154.185.26, 18.154.185.57, 18.154.185.58, 18.154.185.68
34,96 ms
Quad9
9.9.9.9
108.157.142.104, 108.157.142.65, 108.157.142.75, 108.157.142.80
83,75 ms
OpenDNS
208.67.222.222
18.154.185.26, 18.154.185.57, 18.154.185.58, 18.154.185.68
82,87 ms
AdGuard
94.140.14.14
13.33.67.105, 13.33.67.12, 13.33.67.36, 13.33.67.93
82,35 ms

IP, geolocation and ASNAssociated network information

18.154.185.26

No data
success
No
country
region
city
asn
organization
isp

18.154.185.58

No data
success
No
country
region
city
asn
organization
isp

18.154.185.68

No data
success
No
country
region
city
asn
organization
isp

18.154.185.57

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

alt2.aspmx.l.google.com

Port 25: Closed/unreachable - 1.3 ms - 
Port 465: Closed/unreachable - 4020.8 ms - 
Port 587: Closed/unreachable - 4017.6 ms -

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