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Total

DNS

Email

Security

Network

100

Availability

Domainzerotothree.org

IPv42

IPv62

MX records1

StatusActive

Domain technical report

Zero To Three | Leading the Way in Early Childhood Development

zerotothree.org

Zero To Three is dedicated to ensuring a strong start for every child. Explore our resources, research, and advocacy for early childhood development.

Generated: 2026-08-10T22:53:21-05:00 · 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 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 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

47 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 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)

172.66.43.85
172.66.40.171

AAAA

2 record(s)

2606:4700:3108::ac42:2b55
2606:4700:3108::ac42:28ab

CNAME

0 record(s)

—

Not configured

MX

1 record(s)

10 zerotothree-org.mail.protection.outlook.com.

TXT

25 record(s)

"PQZ/c1JCVBiwX5c5XNm+rutGPB2EGbDfbM8GNDcIgP7hgrsAuiLlbBxd1prYu1AM6wP2jvz27qLEjcvb04/dHw=="
"ksx74c95wrr99k54v2lx5sym55y8fvnq"
"google-site-verification=2W9WPyfG7AbXVp5ePkRJLhZRVcC31DYgamAvU3nsClc"
"bw=P+bWSs+gL3loh6oCtGWZiTt0TJBy78u/9lF0E5xgkDOr"
"google-site-verification=C1xOaHh3clzYOCh_4gb4gEBy9tC2qZu2eehkI3vhEVs"
"_6t5lw7h9s488nozqufnfk8odqxrztjx"
"1har022gcp3mj27989h7f8qgqc"
"wmBABfQvgCSy9eJsH4WJKVsLAdpjHqtt+wjiy19oPK4="
"v=spf1 ip4:38.32.187.114 include:spf.protection.outlook.com include:spf-2248456.jmsend.com include:spf.zoho.com include:spf.cadmiumcd.com include:_spf.intacct.com include:_spf.salesforce.com ~all"
"wrike-verification=MjE0MTQ2NTozNjY2ZjlhOWEzYjZiOTk4ODU4Mjk2ZmI0ZWYyZDNkZjc5YWViMDEyZjYzNzU2MjU5OGQ5ZjJmNGRjNzllZWUz"
"atlassian-sending-domain-verification=62d5532f-0629-414d-a547-bc71a19b70a5"
"5342kolpgkhntvji2emd9hyp41nbl4"
"pardot565212=ebf67acdaaa43214d69ce74fb448d4e58b424632534f2b7aa8bd297d4747b007"
"z0pnqs2c1wwfdtndrkpt435myylltyyk"
"k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDGoQCNwAQdJBy23MrShs1EuHqK/dtDC33QrTqgWd9CJmtM3CK2ZiTYugkhcxnkEtGbzg+IJqcDRNkZHyoRezTf6QbinBB2dbyANEuwKI5DVRBFowQOj9zvM3IvxAEboMlb0szUjAoML94HOkKuGuCkdZ1gbVEi3GcVwrIQphal1QIDAQAB"
"oejrvuvge3j4ug48bllm5dl6pg"
"vdgwpqchjxrptqcf5jrhf2z39mb18hp4"
"facebook-domain-verification=5342kolpgkhntvji2emd9hyp41nbl4"
"asv=d64dd2108452f37b4b0bd99cb900a650"
"box-domain-verification=37bf06dba9f191d094fdf97a8f59ac138e1022a732512d5e4a1aa9117ba1a0b9"
"MS=ms56316783"
"pardot565212=075e030b5c87424e5ec8bd629cb8841b118955d6e4cb0cdcbe259ecb85bd750f"
"atlassian-domain-verification=AzFeyhvaxjpQnhfXTzZFYUHsXUltqmWFBtmzpYcc84GM3uQyShHFp9O4eIKWauH6"
"154a264ab2839813b0af397c8777e4cf5ec41254f35e24a502d0d477f6311221"
"proxy-ssl.webflow.com"

NS

2 record(s)

ben.ns.cloudflare.com.
jean.ns.cloudflare.com.

SOA

1 record(s)

ben.ns.cloudflare.com. dns.cloudflare.com. 2411509158 10000 2400 604800 1800

SPF

Configured

v=spf1 ip4:38.32.187.114 include:spf.protection.outlook.com include:spf-2248456.jmsend.com include:spf.zoho.com include:spf.cadmiumcd.com include:_spf.intacct.com include:_spf.salesforce.com ~all

DMARC

Configured

v=DMARC1; p=none; rua=mailto:rua@zerotothree.org,mailto:dmarc_agg@vali.email; ruf=mailto:ruf@zerotothree.org;

DKIM

Selector selector1

v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDAo/R9mwZQk0rpL3mtRG/gilAbz0ESiVYb4eLe2cLz6FaQOewxj0mm6LouZE7o7Lmi+1fnqvHMkA2eePNHFvAEJkXP+KIp9GwDgSwK7RsaTx97jq/iGYDALGLY57LbeuGJd/XQicfpY7kuoGl/R+fSBEtCwUxBebrXErYn21FhzQIDAQAB; n=1024,1453312855,1469037655

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

Zero To Three | Leading the Way in Early Childhood Development

Description

Zero To Three is dedicated to ensuring a strong start for every child. Explore our resources, research, and advocacy for early childhood development.

Final URL

https://www.zerotothree.org/

HTTP status

206

HTTP

Status

HTTP/2 200

Final URL

https://www.zerotothree.org/

Version

Server

cloudflare

X-Powered-By

WP Engine

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Let's Encrypt

zerotothree.org

Valid from

2026-06-29T22:08:08-05:00

Valid until

2026-09-27T22:08:07-05:00

Days remaining

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

172.66.40.171, 172.66.43.85

73,94 ms

Cloudflare

1.1.1.1

172.66.40.171, 172.66.43.85

61,89 ms

Quad9

9.9.9.9

172.66.40.171, 172.66.43.85

73,72 ms

OpenDNS

208.67.222.222

172.66.40.171, 172.66.43.85

75,13 ms

AdGuard

94.140.14.14

172.66.40.171, 172.66.43.85

405,60 ms

IP, geolocation and ASNAssociated network information

172.66.43.85

No data

success

country

region

city

asn

organization

isp

172.66.40.171

No data

success

country

region

city

asn

organization

isp

Visitor information

Visitor

216.73.217.62

reverse

country

country_code

region

city

latitude

longitude

isp

organization

asn

timezone

browser

Other

language

user_agent

Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

is_bot

Yes

cloudflare

SMTPEmail port connectivity

zerotothree-org.mail.protection.outlook.com

Port 25: Closed/unreachable - 26.6 ms - 
Port 465: Closed/unreachable - 4043.3 ms - 
Port 587: Closed/unreachable - 4020.2 ms -

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