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92
Total
100
DNS
90
Email
88
Security
70
Network
100
Availability
Domainnctm.org
IPv42
IPv62
MX records1
StatusActive
Domain technical report

Index - National Council of Teachers of Mathematics

nctm.org

Founded in 1920, the National Council of Teachers of Mathematics (NCTM) is the largest organization in the world dedicated to improving mathematics education.,

Generated: 2026-08-10T22:58:44-05:00 · Cached result

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IPv42
IPv62
MX1
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 chain15 / 15 pts · Dns

DS and DNSKEY detected.

✓
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-STS0 / 5 pts · Mail

Mail transport policy.

!
TLS-RPT0 / 5 pts · Mail

TLS reporting policy.

✓
Valid TLS certificate55 / 55 pts · Security

38 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

i
HTTP security headers23 / 35 pts · Security

6 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

2 record(s)
172.66.40.185
172.66.43.71

AAAA

2 record(s)
2606:4700:3108::ac42:2b47
2606:4700:3108::ac42:28b9

CNAME

0 record(s)
—

Not configured

MX

1 record(s)
0 nctm-org.mail.protection.outlook.com.

TXT

5 record(s)
"v=spf1 ip4:107.181.111.64/26 include:spf.protection.outlook.com include:amazonses.com include:mmsend.com include:mail.zohoanalytics.com include:spf.aievolution.com include:_spf.messagereach.com ~all"
"google-site-verification=VaXuJi-mI2iW8nArYivajxhaZtaP3e2ZPrkGDJ-g8Ik"
"_lxj4uordh4q7er083hti0ayque1yhii"
"bw=btneLCMroMixOqmTopd5Uvb3+DDj3N711nsT3B3QM0Fr"
"stripe-verification=6342A739B2B71AA293677D2E96CB02D43E1EBB26C7A975F6B405F42A5082B0F4"

NS

2 record(s)
sam.ns.cloudflare.com.
kay.ns.cloudflare.com.

SOA

1 record(s)
kay.ns.cloudflare.com. dns.cloudflare.com. 2411827677 10000 2400 604800 1800

CAA

21 record(s)
0 issue "amazon.com"
0 issue "pki.goog; cansignhttpexchanges=yes"
0 issue "ssl.com"
0 issuewild "ssl.com"
0 issuewild "amazontrust.com"
0 issue "letsencrypt.org"
0 issue "amazonaws.com"
0 issuewild "pki.goog; cansignhttpexchanges=yes"
0 issuewild "letsencrypt.org"
0 issuewild "amazon.com"
0 issue "awstrust.com"
0 issue "globalsign.com"
0 issue "comodoca.com"
0 issuewild "digicert.com; cansignhttpexchanges=yes"
0 issue "digicert.com; cansignhttpexchanges=yes"
0 issuewild "globalsign.com"
0 iodef "mailto:raldridge@nctm.org"
0 issuewild "comodoca.com"
0 issuewild "amazonaws.com"
0 issue "amazontrust.com"
0 issuewild "awstrust.com"

DS

1 record(s)
2371 13 2 0F2A1E10414ADA3BFBA038D328EF03FFF035E1F103456F58DCF3B3A0 8C54FBBC

DNSKEY

2 record(s)
257 3 13 mdsswUyr3DPW132mOi8V9xESWE8jTo0dxCjjnopKl+GqJxpVXckHAeF+ KkxLbxILfDLUT0rAK9iUzy1L53eKGQ==
256 3 13 oJMRESz5E4gYzS/q6XDrvU1qMPYIjCWzJaOau8XNEZeqCYKD5ar0IRd8 KqXXFJkqmVfRvMGPmM1x8fGAa2XhSA==

RRSIG

0 record(s)
—

Not configured

NSEC

1 record(s)
\000.nctm.org. A NS SOA PTR HINFO MX TXT AAAA LOC SRV NAPTR CERT SSHFP RRSIG NSEC DNSKEY TLSA SMIMEA HIP CDS CDNSKEY OPENPGPKEY SVCB HTTPS URI CAA

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 ip4:107.181.111.64/26 include:spf.protection.outlook.com include:amazonses.com include:mmsend.com include:mail.zohoanalytics.com include:spf.aievolution.com include:_spf.messagereach.com ~all

DMARC

Configured
v=DMARC1;p=quarantine;pct=100;rua=mailto:addc4f213fea45a99cf2fd7831fe6b20@dmarc-reports.cloudflare.net;ri=86400;fo=1;aspf=r

DKIM

Selector selector1
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCuMbGTGdQGJABnFgUES/bk72mxLWqdDSfg5pSZ5p1cNMW5LBpDqs4tTr6CEMxXQREZBMV6LJ/L/eXaRglQRpXhWQHNNpouzfnz9UdwMLkoitztdRMJYXf7dciXUXDiNubBmcZ9fJiSJSjVUUrqbccWXEiBIyYWmr/QoyJvQN7PJQIDAQAB; n=1024,1449064629,1464875829

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
Index - National Council of Teachers of Mathematics
Description
Founded in 1920, the National Council of Teachers of Mathematics (NCTM) is the largest organization in the world dedicated to improving mathematics education.,
Final URL
https://www.nctm.org/
HTTP status
200

HTTP

Status
HTTP/2 200
Final URL
https://www.nctm.org/
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
nctm.org
Valid from
2026-06-20T16:59:08-05:00
Valid until
2026-09-18T17:59:05-05:00
Days remaining
38
Protocol
TLSv1.3
Cipher
TLS_AES_256_GCM_SHA384

Security headers

6 active
✓
HSTSImplemented
✓
Content Security PolicyImplemented
✓
X-Content-Type-OptionsImplemented
—
X-Frame-OptionsNot detected
✓
Referrer PolicyImplemented
✓
Permissions PolicyImplemented
✓
Cross-Origin-Opener-PolicyImplemented
—
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
172.66.40.185, 172.66.43.71
57,65 ms
Cloudflare
1.1.1.1
172.66.40.185, 172.66.43.71
64,03 ms
Quad9
9.9.9.9
172.66.40.185, 172.66.43.71
56,13 ms
OpenDNS
208.67.222.222
172.66.40.185, 172.66.43.71
67,06 ms
AdGuard
94.140.14.14
172.66.40.185, 172.66.43.71
43,87 ms

IP, geolocation and ASNAssociated network information

172.66.40.185

No data
success
No
country
region
city
asn
organization
isp

172.66.43.71

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

nctm-org.mail.protection.outlook.com

Port 25: Closed/unreachable - 41.4 ms - 
Port 465: Closed/unreachable - 4056.5 ms - 
Port 587: Closed/unreachable - 4021.5 ms -

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