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78
Total
95
DNS
45
Email
65
Security
85
Network
100
Availability
Domaincodemirror.net
IPv41
IPv61
MX records1
StatusActive
Domain technical report

CodeMirror

codemirror.net

In-browser code editor

Generated: 2026-08-10T19:36:44-05:00 · Cached result

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IPv41
IPv61
MX1
NS3

DiagnosticsMain findings and recommendations

✓
IPv4 (A)30 / 30 pts · Dns

1 IPv4 address(es) detected.

✓
IPv6 (AAAA)10 / 10 pts · Dns

1 IPv6 address(es) detected.

✓
Name server redundancy20 / 20 pts · Dns

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

✓
SOA record10 / 10 pts · Dns

Authoritative zone record.

✓
DNSSEC chain15 / 15 pts · Dns

DS and DNSKEY detected.

!
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.

!
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

69 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 DNS30 / 30 pts · Network

PTR: mail.marijnhaverbeke.nl

i
IPv4 diversity20 / 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/1.1 200 OK

✓
HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

1 record(s)
149.210.142.219

AAAA

1 record(s)
2a01:7c8:aab0:26e:5054:ff:fe3a:8388

CNAME

0 record(s)
—

Not configured

MX

1 record(s)
50 mail.marijnhaverbeke.nl.

TXT

2 record(s)
"v=spf1 mx include:mail.marijnhaverbeke.nl ?all"
"v=DMARC1; p=none"

NS

3 record(s)
ns0.transip.net.
ns1.transip.nl.
ns2.transip.eu.

SOA

1 record(s)
ns0.transip.net. hostmaster.transip.nl. 2024053001 86400 1800 2419200 300

CAA

0 record(s)
—

Not configured

DS

1 record(s)
43174 13 2 01B632F247AF6A008EAA7698B9903D4DC5CC30B2F9BF9E47B29F5B0C 21008ABC

DNSKEY

2 record(s)
256 3 13 /PcNY+lsTDFFv2XyPI6L0pecM7rAQdsqgSpLCea4hJQWeovqgVqi+6sz sRUZvQCAskxYc/Y6DvN6BHaZYaf/ew==
257 3 13 4wGM7OLm8tlZ+9UGT5SJjYkmDcDV7GDYhjmna00BFAC5KAS4IdJnQd84 aHTvQilf++X+r1Hya1B0uyip8BoN1w==

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 mx include:mail.marijnhaverbeke.nl ?all

DMARC

Not configured
—

Not configured

DKIM

Not found
—

Not configured

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
CodeMirror
Description
In-browser code editor
Final URL
https://codemirror.net/
HTTP status
200

HTTP

Status
HTTP/1.1 200 OK
Final URL
https://codemirror.net/
Version
2
Server
nginx/1.26.3
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Let's Encrypt
CN
codemirror.net
Valid from
2026-07-21T13:26:07-05:00
Valid until
2026-10-19T13:26:06-05:00
Days remaining
69
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
149.210.142.219
39,84 ms
Cloudflare
1.1.1.1
149.210.142.219
224,80 ms
Quad9
9.9.9.9
149.210.142.219
23,26 ms
OpenDNS
208.67.222.222
149.210.142.219
232,70 ms
AdGuard
94.140.14.14
149.210.142.219
40,72 ms

IP, geolocation and ASNAssociated network information

149.210.142.219

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

mail.marijnhaverbeke.nl

Port 25: Closed/unreachable - 107.9 ms - 
Port 465: Closed/unreachable - 204.1 ms - 
Port 587: Closed/unreachable - 97.3 ms -

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