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78
Total
70
DNS
70
Email
77
Security
65
Network
100
Availability
Domainzotero.org
IPv43
IPv60
MX records1
StatusActive
Domain technical report

Zotero | Your personal research assistant

zotero.org

Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.

Generated: 2026-08-08T23:23:06-05:00 · Cached result

JSONCSVPDFVisit site
IPv43
IPv60
MX1
NS4

DiagnosticsMain findings and recommendations

✓
IPv4 (A)30 / 30 pts · Dns

3 IPv4 address(es) detected.

!
IPv6 (AAAA)0 / 10 pts · Dns

0 IPv6 address(es) detected.

✓
Name server redundancy20 / 20 pts · Dns

4 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.

!
DKIM0 / 20 pts · Mail

No tested DKIM selector responded.

!
MTA-STS0 / 5 pts · Mail

Mail transport policy.

!
TLS-RPT0 / 5 pts · Mail

TLS reporting policy.

✓
Valid TLS certificate55 / 55 pts · Security

83 day(s) remaining.

✓
Certificate lifetime10 / 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 DNS30 / 30 pts · Network

PTR: ec2-100-60-49-137.compute-1.amazonaws.com

✓
IPv4 diversity35 / 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

3 record(s)
100.60.49.137
54.243.70.236
3.227.79.205

AAAA

0 record(s)
—

Not configured

CNAME

0 record(s)
—

Not configured

MX

1 record(s)
10 mail.zotero.org.

TXT

1 record(s)
"v=spf1 mx include:amazonses.com -all"

NS

4 record(s)
ns-1395.awsdns-46.org.
ns-1678.awsdns-17.co.uk.
ns-496.awsdns-62.com.
ns-635.awsdns-15.net.

SOA

1 record(s)
ns-1395.awsdns-46.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400

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 mx include:amazonses.com -all

DMARC

Configured
v=DMARC1; p=quarantine; pct=100; sp=reject; rua=mailto:dmarc-reports@zotero.org; ruf=mailto:dmarc-reports@zotero.org; fo=1

DKIM

Not found
—

Not configured

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
Zotero | Your personal research assistant
Description
Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Final URL
https://www.zotero.org/
HTTP status
206

HTTP

Status
HTTP/2 200
Final URL
https://www.zotero.org/
Version
3
Server
Apache
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Amazon
CN
zotero.org
Valid from
2026-04-16T19:00:00-05:00
Valid until
2026-10-31T18:59:59-05:00
Days remaining
83
Protocol
TLSv1.3
Cipher
TLS_AES_128_GCM_SHA256

Security headers

3 active
✓
HSTSImplemented
✓
Content Security PolicyImplemented
—
X-Content-Type-OptionsNot detected
✓
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
100.60.49.137, 3.227.79.205, 54.243.70.236
34,16 ms
Cloudflare
1.1.1.1
100.60.49.137, 3.227.79.205, 54.243.70.236
18,89 ms
Quad9
9.9.9.9
100.60.49.137, 3.227.79.205, 54.243.70.236
39,57 ms
OpenDNS
208.67.222.222
100.60.49.137, 3.227.79.205, 54.243.70.236
72,59 ms
AdGuard
94.140.14.14
100.60.49.137, 3.227.79.205, 54.243.70.236
90,93 ms

IP, geolocation and ASNAssociated network information

100.60.49.137

No data
success
No
country
region
city
asn
organization
isp

54.243.70.236

No data
success
No
country
region
city
asn
organization
isp

3.227.79.205

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

mail.zotero.org

Port 25: Closed/unreachable - 8.5 ms - 
Port 465: Closed/unreachable - 4027.7 ms - 
Port 587: Closed/unreachable - 27.5 ms - 220 mail.zotero.org ESMTP Postfix

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