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57
Total
80
DNS
0
Email
73
Security
70
Network
60
Availability
Domaininvisionfree.com
IPv42
IPv62
MX records0
StatusActive
Domain technical report

invisionfree.com | 520: Web server is returning an unknown error

invisionfree.com

Generated: 2026-08-10T10:41:46-05:00 · Cached result

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IPv42
IPv62
MX0
NS2

DiagnosticsMain findings and recommendations

✓
IPv4 (A)30 / 30 pts · Dns

2 IPv4 address(es) detected.

✓
IPv6 (AAAA)10 / 10 pts · Dns

2 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 records0 / 20 pts · Mail

0 MX record(s).

!
SPF0 / 25 pts · Mail

SPF policy not found.

!
DMARC0 / 25 pts · Mail

DMARC policy not found.

!
DKIM0 / 20 pts · Mail

No tested DKIM selector responded.

!
MTA-STS0 / 5 pts · Mail

Mail transport policy.

!
TLS-RPT0 / 5 pts · Mail

TLS reporting policy.

✓
Valid TLS certificate55 / 55 pts · Security

77 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 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 response0 / 40 pts · Availability

HTTP/2 520

✓
HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

2 record(s)
172.67.173.156
104.21.96.62

AAAA

2 record(s)
2606:4700:3034::6815:603e
2606:4700:3037::ac43:ad9c

CNAME

0 record(s)
—

Not configured

MX

0 record(s)
—

Not configured

TXT

0 record(s)
—

Not configured

NS

2 record(s)
cory.ns.cloudflare.com.
mira.ns.cloudflare.com.

SOA

1 record(s)
cory.ns.cloudflare.com. dns.cloudflare.com. 2410824839 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

Not configured
—

Not configured

DMARC

Not configured
—

Not configured

DKIM

Not found
—

Not configured

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
invisionfree.com | 520: Web server is returning an unknown error
Description
Final URL
https://invisionfree.com/
HTTP status
520

HTTP

Status
HTTP/2 520
Final URL
https://invisionfree.com/
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
invisionfree.com
Valid from
2026-07-29T09:31:48-05:00
Valid until
2026-10-27T10:28:58-05:00
Days remaining
77
Protocol
TLSv1.3
Cipher
TLS_AES_256_GCM_SHA384

Security headers

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

Consistent
✓
Consistent propagation

5 public resolvers queried.

ResolverServerResultLatency
Google
8.8.8.8
104.21.96.62, 172.67.173.156
61,59 ms
Cloudflare
1.1.1.1
104.21.96.62, 172.67.173.156
45,84 ms
Quad9
9.9.9.9
104.21.96.62, 172.67.173.156
42,13 ms
OpenDNS
208.67.222.222
104.21.96.62, 172.67.173.156
53,97 ms
AdGuard
94.140.14.14
104.21.96.62, 172.67.173.156
162,68 ms

IP, geolocation and ASNAssociated network information

172.67.173.156

No data
success
No
country
region
city
asn
organization
isp

104.21.96.62

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

invisionfree.com

Port 25: Closed/unreachable - 3.5 ms - 
Port 465: Closed/unreachable - 4020.7 ms - 
Port 587: Closed/unreachable - 4019.4 ms -

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