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83
Total
80
DNS
90
Email
73
Security
70
Network
100
Availability
Domaincolorado.edu
IPv44
IPv64
MX records1
StatusActive
Domain technical report

Home | University of Colorado Boulder

colorado.edu

Generated: 2026-08-08T19:10:57-05:00 · Cached result

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IPv44
IPv64
MX1
NS6

DiagnosticsMain findings and recommendations

✓
IPv4 (A)30 / 30 pts · Dns

4 IPv4 address(es) detected.

✓
IPv6 (AAAA)10 / 10 pts · Dns

4 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 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

15 day(s) remaining.

i
Certificate lifetime6 / 10 pts · Security

Full points require at least 30 days remaining.

i
HTTP security headers12 / 35 pts · Security

3 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

4 record(s)
151.101.66.133
151.101.130.133
151.101.2.133
151.101.194.133

AAAA

4 record(s)
2a04:4e42::645
2a04:4e42:600::645
2a04:4e42:200::645
2a04:4e42:400::645

CNAME

0 record(s)
—

Not configured

MX

1 record(s)
10 colorado-edu.mail.protection.outlook.com.

TXT

19 record(s)
"bw=E1ibKK7mvTTWmq1SV+b/usJyVdN63EU+WFJh+SCp+abE"
"brevo-code:5f9e8714a4a7c561eb4cdf0848811c11"
"google-site-verification=iaVX54MaxYscXlrL-DxuE9qtvLhAXkXKhG8sjiH5q-0"
"jamf-site-verification=V7i5P5-QM02gTP25eIhZIA"
"MS=ms27269994"
"atlassian-sending-domain-verification=0b36ce8f-b8ec-42ae-8513-2264ea6d72e7"
"yahoo-verification-key=LBMWN06qx3V2Edw1euv/698yUrWMNip2Dx3Y4yyVmYE="
"brevo-code:d6b523305300718643a7da77b3feeccb"
"docusign=7412fd08-3676-471a-8b65-8cc2b13c8137"
"bMFGPNmrr7aoZsBWqexbujPiPjVzJe4wrZfl/t81eGptVxvkprdRSqKfj3paVrFcRhsrQHBlMGIR86eXUIYbCw=="
"d365mktkey=gzYMp5Xcnapx0VINCqRrvMtsD0TBSpLsrFjihN9HWQAx"
"_3x6w07ujdy2wk71two4k8r4mwmtw6tq"
"brevo-code:ac843dd83e2d2a3d8becd980f7193d9b"
"brevo-code:814ad43e9f25b1a52d6a2b213fcfae73"
"atlassian-domain-verification=QAg9aEn1gpS7HapLhSZbdUei9wTKTCl8EKYsTFg5su7bO2Pu30QtUg9QsGZzz1Vw"
"docusign=dcb8d5d8-71e8-4884-8604-02297bea8072"
"v=spf1 ip4:128.138.1.0/24 ip4:128.138.48.0/20 ip4:128.138.64.0/18 ip4:128.138.128.0/17 ip4:204.228.68.0/22 ip4:132.194.255.30 ip4:136.147.136.157 include:_spf1.colorado.edu include:_spf2.colorado.edu ~all"
"openai-domain-verification=dv-5hwuyXiWaOnaq12vb3n73azV"
"d365mktkey=CgcAzx2nkxamTBkNT7jagrT8Nadf6LPzlI0MLQHdKA0x"

NS

6 record(s)
a11-66.akam.net.
a22-67.akam.net.
a20-65.akam.net.
a3-66.akam.net.
a2-67.akam.net.
a1-153.akam.net.

SOA

1 record(s)
a1-153.akam.net. dnsadmin.colorado.edu. 2026080800 3600 1200 2419200 3600

CAA

0 record(s)
—

Not configured

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 ip4:128.138.1.0/24 ip4:128.138.48.0/20 ip4:128.138.64.0/18 ip4:128.138.128.0/17 ip4:204.228.68.0/22 ip4:132.194.255.30 ip4:136.147.136.157 include:_spf1.colorado.edu include:_spf2.colorado.edu ~all

DMARC

Configured
v=DMARC1; p=reject; sp=none; pct=100; adkim=r; aspf=r; rua=mailto:dmarc_agg@vali.email,mailto:dmarc-rua@colorado.edu;

DKIM

Selector default
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDJa4aTsM41X98vkmuJn6n6kGtfBN6/Eq77kWao3nxEEAB2mp3iHPwPf3o25gXSau7uNEtqGm8f6sT8WMyfIRwqCd1HoeX2gWFHnMe0NTkBZcYJj8jbtU8OwFRs9xu1b4tPsBi5j8sZ7Rf1KE65SxkxGipArfsj8Q5fLImxE9b89wIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
Home | University of Colorado Boulder
Description
Final URL
https://www.colorado.edu/
HTTP status
200

HTTP

Status
HTTP/2 200
Final URL
https://www.colorado.edu/
Version
3
Server
nginx
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Certainly
CN
colorado.edu
Valid from
2026-07-25T01:27:30-05:00
Valid until
2026-08-24T01:27:29-05:00
Days remaining
15
Protocol
TLSv1.2
Cipher
ECDHE-RSA-AES128-GCM-SHA256

Security headers

3 active
✓
HSTSImplemented
—
Content Security PolicyNot detected
✓
X-Content-Type-OptionsImplemented
✓
X-Frame-OptionsImplemented
—
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
151.101.130.133, 151.101.194.133, 151.101.2.133, 151.101.66.133
23,92 ms
Cloudflare
1.1.1.1
151.101.130.133, 151.101.194.133, 151.101.2.133, 151.101.66.133
26,78 ms
Quad9
9.9.9.9
151.101.130.133, 151.101.194.133, 151.101.2.133, 151.101.66.133
146,54 ms
OpenDNS
208.67.222.222
151.101.130.133, 151.101.194.133, 151.101.2.133, 151.101.66.133
25,08 ms
AdGuard
94.140.14.14
151.101.130.133, 151.101.194.133, 151.101.2.133, 151.101.66.133
40,85 ms

IP, geolocation and ASNAssociated network information

151.101.66.133

No data
success
No
country
region
city
asn
organization
isp

151.101.130.133

No data
success
No
country
region
city
asn
organization
isp

151.101.2.133

No data
success
No
country
region
city
asn
organization
isp

151.101.194.133

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

colorado-edu.mail.protection.outlook.com

Port 25: Closed/unreachable - 27.1 ms - 
Port 465: Closed/unreachable - 4019.8 ms - 
Port 587: Closed/unreachable - 4036 ms -

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