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Total

DNS

Email

Security

Network

Availability

Domaincaltech.edu

IPv41

IPv60

MX records2

StatusActive

Domain technical report

caltech.edu

Generated: 2026-08-08T19:50:47-05:00 · Cached result

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IPv41

IPv60

MX2

NS2

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

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 policy0 / 5 pts · Dns

Certificate authority restriction.

✓

DNS propagation10 / 10 pts · Dns

Agreement between public resolvers.

✓

MX records20 / 20 pts · Mail

2 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

140 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: ec2-52-26-125-194.us-west-2.compute.amazonaws.com

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 response0 / 40 pts · Availability

No successful HTTP response.

✓

HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

1 record(s)

52.26.125.194

AAAA

0 record(s)

—

Not configured

CNAME

0 record(s)

—

Not configured

MX

2 record(s)

10 mx1.caltech.iphmx.com.
10 mx2.caltech.iphmx.com.

TXT

13 record(s)

"amazonses:CBaUu/J2wBFtHuO9isUzHAXTnIWcN5RyPUBvggu7SNE="
"v=spf1 ip4:131.215.0.0/16 ip4:134.4.0.0/16 ip4:192.100.16.0/24 ip4:198.129.208.0/23 ip4:208.69.128.0/22 ip4:199.188.184.0/22 ip4:198.202.125.128/25 ip4:74.122.104.0/22 ip4:72.10.184.102 ip4:72.10.184.103 ip4:72.10.182.15 ip4:72.10.182.16 " "include:spf.protection.outlook.com include:sendgrid.net include:mktomail.com include:spf.dynect.net include:cust-spf.cashnet.com include:amazonses.com include:_spf.createsend.com include:_spf01.mykronos.com include:_s0.caltech.edu ?all"
"ZOOM_verify_a-Gb5-aqQgygEiKsnho63w"
"anthropic-domain-verification-rw8528=rFwrZAPawzCVNGD318e9zzavQ"
"openai-domain-verification=dv-8LkNkbqCFWsyOdGQbgXugk2j"
"Y84qDmmAIPozyUoBIRWmXsFltoU2Pl8b8WGKPlqgz+1t5Db4z9H5ngaaCTq3TTaOK+SCPYUsGVlGn0wUzXNdow=="
"apple-domain-verification=KD7b3wNXe76BHRAV"
"MS=ms43712753"
"1password-site-verification=VRLN67QMNNEPXIIREL6TDZABF4"
"autodesk-domain-verification=TtWEzwdFn86i9o8NX_8R"
"iContact1389932"
"amazonses:X9y0RbFXXvxu3ft83xg2e+YV++OUePTUSeCOdB3Chjg="
"adobe-idp-site-verification=1e150df049a820e49156727d1b84c48a1ae11f66f87ad76d2cf30cb9d378acb6"

NS

2 record(s)

ns0239.secondary.cloudflare.com.
ns0090.secondary.cloudflare.com.

SOA

1 record(s)

ns0090.secondary.cloudflare.com. hostmaster.caltech.edu. 2022899250 10800 3600 2592000 900

CAA

0 record(s)

—

Not configured

DS

1 record(s)

2371 13 2 DD9BC517A0668E5513CA5E546E6D155FC07358D3093245481462C370 33EB1A90

DNSKEY

2 record(s)

256 3 13 oJMRESz5E4gYzS/q6XDrvU1qMPYIjCWzJaOau8XNEZeqCYKD5ar0IRd8 KqXXFJkqmVfRvMGPmM1x8fGAa2XhSA==
257 3 13 mdsswUyr3DPW132mOi8V9xESWE8jTo0dxCjjnopKl+GqJxpVXckHAeF+ KkxLbxILfDLUT0rAK9iUzy1L53eKGQ==

RRSIG

6 record(s)

SOA 13 2 900 20260810015037 20260807235037 34505 caltech.edu. xBHAN5oPRPD8sYuprAaNYUIJ/41iADIaNsIgNadNdea/LkLfyt4O1Bu0 TubhWN2EyR+8GD82qYfhKPcD7Af0mg==
NS 13 2 43200 20260810015037 20260807235037 34505 caltech.edu. lAuPmTKrFOWcfGTclhkHQTPZue8mBF4G3c3aJJgwPsU0xZlNsSwoHAJS ouCyH1w2QzmayzF3dVeBJE2rMtgTRA==
TXT 13 2 3600 20260810015037 20260807235037 34505 caltech.edu. uUhG9Be+p1KEJjUvf8wAK4wFo6535Kt0TsqmNoPfyNbfWg5e7V0Pzkv9 XwYQVvsx2YdhY0WhZycLiufi0+x6hQ==
A 13 2 300 20260810015037 20260807235037 34505 caltech.edu. Vu6VyLfNTTMD3oWqlskH7Z3YSBe1gbitNt5TbZHBK0569KEQtcz0C1Yq 2iCbCPrW2/o3Scq3o/yU6jrJ9Meklg==
MX 13 2 43200 20260809225001 20260807205001 34505 caltech.edu. seExHCXcdMfO1tpOipWv8eMuzVl3PpMfOccQ0rLrgthCRLKVlIX8M9TQ UD4M70/tTnIT8r4cMifjFK89OAyWVA==
DS 13 2 86400 20260814033304 20260807022304 6705 edu. EeeDM/iDi1ZiliNdMSiEIIo8CiqUcEA8xHqd04XgbzKiK3egpH36uxnm 4uWZo8Hq+RTy+z9posJ28jQnP0FxJg==

NSEC

1 record(s)

\000.caltech.edu. 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 ip4:131.215.0.0/16 ip4:134.4.0.0/16 ip4:192.100.16.0/24 ip4:198.129.208.0/23 ip4:208.69.128.0/22 ip4:199.188.184.0/22 ip4:198.202.125.128/25 ip4:74.122.104.0/22 ip4:72.10.184.102 ip4:72.10.184.103 ip4:72.10.182.15 ip4:72.10.182.16 include:spf.protection.outlook.com include:sendgrid.net include:mktomail.com include:spf.dynect.net include:cust-spf.cashnet.com include:amazonses.com include:_spf.createsend.com include:_spf01.mykronos.com include:_s0.caltech.edu ?all

DMARC

Configured

v=DMARC1; p=none; rua=mailto:6e39dba0@mxtoolbox.dmarc-report.com,mailto:caltech@us.cp-dmarc.com; ruf=mailto:6e39dba0@forensics.dmarc-report.com,mailto:caltech@us.cp-dmarc.com; fo=1

DKIM

Selector default

v=DKIM1; t=y; g=*; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC79eN71kuiG4vu4h0zC+IjdQFcahJY/mI6Lbz8hvvRCY4GzY5x8A3ePth0zmbgQGu6GpjtO0FVmP6E4ZG0iasmh20m5lLN8N9GA1IK0l5XJMIK+INqM8Kq1wt/TtybcmnyZO2Ip1laGs55dmLlqSuvjfjuA2qm1msmn9ofHx7IUwIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

No data

Title

Description

Final URL

https://caltech.edu/

HTTP status

HTTP

Status

Final URL

https://caltech.edu/

Version

Server

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

InCommon, LLC

caltech.edu

Valid from

2026-06-11T19:00:00-05:00

Valid until

2026-12-27T17:59:59-06:00

Days remaining

140

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

52.26.125.194

76,63 ms

Cloudflare

1.1.1.1

52.26.125.194

47,47 ms

Quad9

9.9.9.9

52.26.125.194

52,29 ms

OpenDNS

208.67.222.222

52.26.125.194

55,80 ms

AdGuard

94.140.14.14

52.26.125.194

70,68 ms

IP, geolocation and ASNAssociated network information

52.26.125.194

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

mx1.caltech.iphmx.com

Port 25: Closed/unreachable - 9.6 ms - 
Port 465: Closed/unreachable - 4019.1 ms - 
Port 587: Closed/unreachable - 4018 ms -

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