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82
Total
75
DNS
100
Email
84
Security
20
Network
100
Availability
Domainmayerbrown.com
IPv41
IPv60
MX records1
StatusActive
Domain technical report

Mayer Brown

mayerbrown.com

Mayer Brown is an international law firm positioned to represent the world’s major corporations, funds and financial institutions in their most important and complex transactions and disputes.

Generated: 2026-08-11T14:45:45-05:00 · Cached result

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IPv41
IPv60
MX1
NS6

DiagnosticsMain findings and recommendations

✓
IPv4 (A)30 / 30 pts · Dns

1 IPv4 address(es) detected.

!
IPv6 (AAAA)0 / 10 pts · Dns

0 IPv6 address(es) detected.

✓
Name server redundancy20 / 20 pts · Dns

6 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 policy5 / 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-STS5 / 5 pts · Mail

Mail transport policy.

✓
TLS-RPT5 / 5 pts · Mail

TLS reporting policy.

✓
Valid TLS certificate55 / 55 pts · Security

39 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

i
HTTP security headers19 / 35 pts · Security

5 of 9 evaluated headers detected.

!
PTR reverse DNS0 / 30 pts · Network

PTR not detected.

i
IPv4 diversity20 / 35 pts · Network

Two or more IPv4 addresses receive full points.

!
IPv6 connectivity0 / 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

1 record(s)
23.100.43.208

AAAA

0 record(s)
—

Not configured

CNAME

0 record(s)
—

Not configured

MX

1 record(s)
2 mayerbrown-com.mail.protection.outlook.com.

TXT

17 record(s)
"canva-site-verification=wV-gXFNeKSzhHX2kGQSFjg"
"MS=ms14764917"
"google-site-verification=tQcPkz2kw4SPOvx-Cn-n6dVckPifdtViI7jIwBtd9d4"
"webexdomainverification.=42e6a038-e82e-4c75-9bef-0aeefa096f67"
"apple-domain-verification=wiigKoOnTXAzjUCa"
"google-site-verification=oVIiQDQQ3Ce-cPUBumZHSE3Y8jy4IKH7cAVrHqJF1sQ"
"v=spf1 include:spf.protection.outlook.com include:us._netblocks.mimecast.com include:egress.mayerbrown.com -all"
"docusign=a243ab19-3d46-4ec3-94fd-2d5da017e321"
"_544avomg1pruqvcd3pmvbyt0ldjiv5w"
"google-site-verification=E0MCr_Ezg2PDCtcdvN_gxCluJNNGJxKnpDFCrQxtNuE"
"intersight=fa311ac3bcb02cdeadfd0bb59e8ba0f6c20a9b9778d4c8fa26cd566dbf971a5c"
"vmware-cloud-verification-8edfb4c3-35a5-49e8-9393-805fc2b3255c"
"perplexity-ai-domain-verification-7rjynn=69BYZ6CW6pJK0110YrwHT8Nqj"
"apple-domain-verification=5P7COqX0gZU20FE7"
"cisco-ci-domain-verification=14d45740d581c3724734ec4fcef6c1a523a8866ab7f9b429713e22d581a2424f"
"miro-verification=0772165b846e4d2474e5e676489ff7d94455864a"
"google-site-verification=kiS5rlx1gmEvCuTYSAmSkGbvCUiIw9fjxqWePKyni6M"

NS

6 record(s)
ns1.mayerbrown.com.
ns5.mayerbrown.com.
ns2.mayerbrown.com.
ns3.mayerbrown.com.
ns6.mayerbrown.com.
ns4.mayerbrown.com.

SOA

1 record(s)
ns1.mayerbrown.com. admin.mayerbrown.com. 2026071304 43200 600 1209600 3600

CAA

7 record(s)
0 issue "awstrust.com"
0 issue "amazon.com"
0 issue "digicert.com"
0 issue "amazonaws.com"
0 issue "letsencrypt.org"
0 issue "sectigo.com"
0 issue "amazontrust.com"

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.protection.outlook.com include:us._netblocks.mimecast.com include:egress.mayerbrown.com -all

DMARC

Configured
v=DMARC1; p=reject; rua=mailto:kn2hgl3wyu@rua.powerdmarc.com

DKIM

Selector selector1
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA1mXxrYYQG0dDNGZQ6jEEXKA+GFBsJc6SSXeJPV3uZdTYvA8FR81MpCGDd718d7i+nNaKHC5mw4jBLahc9vrSIQlaPP949+pOy3Lqyo2vueajDgVLDdItTaHmUTuZaaekbPN4UQXmT61UzKAv2ovtjsYYHnfnpdKzmR+391LeTsToKVsQwKM40yhp6+04lBkKTbM6eGWJWcbSv3Ntd4pQh/5KXmAlY/9t4ogueR7qNfWf3Hdrs/XRIsb4/kD4+8urtkkOCtEYNuJ/M3dg5dHyIiiYfpbmJ0HQzelsU9Q5PgQWyAZTtjaicqdB7oGcTK3UME0pfO0L/mU+WhS/SbkqOQIDAQAB;

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
Mayer Brown
Description
Mayer Brown is an international law firm positioned to represent the world’s major corporations, funds and financial institutions in their most important and complex transactions and disputes.
Final URL
https://www.mayerbrown.com/en
HTTP status
200

HTTP

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

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
DigiCert Inc
CN
www.mayerbrown.com
Valid from
2026-03-04T18:00:00-06:00
Valid until
2026-09-19T18:59:59-05:00
Days remaining
39
Protocol
TLSv1.3
Cipher
TLS_AES_256_GCM_SHA384

Security headers

5 active
✓
HSTSImplemented
✓
Content Security PolicyImplemented
✓
X-Content-Type-OptionsImplemented
✓
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
23.100.43.208
94,41 ms
Cloudflare
1.1.1.1
23.100.43.208
140,45 ms
Quad9
9.9.9.9
23.100.43.208
78,81 ms
OpenDNS
208.67.222.222
23.100.43.208
260,06 ms
AdGuard
94.140.14.14
23.100.43.208
346,81 ms

IP, geolocation and ASNAssociated network information

23.100.43.208

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

mayerbrown-com.mail.protection.outlook.com

Port 25: Closed/unreachable - 35.6 ms - 
Port 465: Closed/unreachable - 4039.1 ms - 
Port 587: Closed/unreachable - 4018.1 ms -

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