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80
Total
70
DNS
90
Email
69
Security
65
Network
100
Availability
Domainduolingo.com
IPv43
IPv60
MX records7
StatusActive
Domain technical report

Duolingo

duolingo.com

Duolingo is the world's most popular way to learn a language. It's 100% free, fun and science-based. Practice online on duolingo.com or on the apps!

Generated: 2026-08-08T20:31:43-05:00 · Cached result

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IPv43
IPv60
MX7
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

7 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

137 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

i
HTTP security headers4 / 35 pts · Security

1 of 9 evaluated headers detected.

✓
PTR reverse DNS30 / 30 pts · Network

PTR: ec2-50-17-4-40.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)
50.17.4.40
52.4.137.170
100.61.158.178

AAAA

0 record(s)
—

Not configured

CNAME

0 record(s)
—

Not configured

MX

7 record(s)
30 aspmx5.googlemail.com.
20 alt1.aspmx.l.google.com.
30 aspmx4.googlemail.com.
10 aspmx.l.google.com.
30 aspmx3.googlemail.com.
30 aspmx2.googlemail.com.
20 alt2.aspmx.l.google.com.

TXT

23 record(s)
"pardot_208162_*=c15d5cb1b9f31e26058e1f30bda9e5d65c57cfeea37b34af8e1dd88474460e90"
"anthropic-domain-verification-z4335b=YssTBALPY7K784Sri4FjVHjd3"
"atlassian-sending-domain-verification=423a5faf-1cfa-4704-a38a-f7adae302dd6"
"_vg2bua41v8x489g1y55hg3hr4h3qmj0"
"apple-domain-verification=bMPI889zOgALUenN"
"klaviyo-site-verification=RKdcF3"
"klaviyo-site-verification=TGmZS7"
"docker-verification=b4ead4c5-fd66-42a5-a684-8f2e7f4c1417"
"openai-domain-verification=dv-ieCpefZUqvVQwb8f7o4SlFye"
"slack-domain-verification=iuNWYimCCkEpnistAJvWc4YOZF8izoZ23TCDek0I"
"rippling-domain-verification=9692f0635321f04d"
"h1-domain-verification=sjPBeaGqQwEe8YhJ3W8JVNJa7WDQFAzc6AHkURoErkh324Yy"
"e622flctk14s3cs3ccdauh8uth"
"spacelift-domain-verification=519xtPXm"
"MS=ms66530579"
"openai-domain-verification=dv-A4cFxdrYIEodfG6UiQU0qxnT"
"google-site-verification=975UaH3lkKONB88HjWDDg34p8cdCqyTVSq_KGBAXrmU"
"pardot_208162_*=610bfb45f202232a79db94c298b30d14332a62a6894e695b025fa7949d7b03fa"
"aliyun-site-verification=1acfc148-50be-45c8-a021-3c933fc8eff9"
"jetbrains-domain-verification=bt8q7duih10l9pmf5fo5yy8wf"
"v=spf1 ip4:100.25.59.11 ip4:205.201.128.0/20 ip4:198.2.128.0/18 ip4:148.105.8.0/21 ip4:52.73.203.75 ip4:52.70.130.33 include:amazonses.com include:_spf.google.com include:_spf.salesforce.com include:mail.zendesk.com include:aspmx.pardot.com ~all"
"amazonses:+SIz2NZPqYri3C+PSIyKShZIbuI4rNpbLlES7lmvpu4="
"stripe-verification=c8d270a115adc8c5a0a84fb24e17b7d05f66aad648d01e86f15548c6d0254ff5"

NS

4 record(s)
ns-247.awsdns-30.com.
ns-1117.awsdns-11.org.
ns-1904.awsdns-46.co.uk.
ns-1020.awsdns-63.net.

SOA

1 record(s)
ns-1020.awsdns-63.net. 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 ip4:100.25.59.11 ip4:205.201.128.0/20 ip4:198.2.128.0/18 ip4:148.105.8.0/21 ip4:52.73.203.75 ip4:52.70.130.33 include:amazonses.com include:_spf.google.com include:_spf.salesforce.com include:mail.zendesk.com include:aspmx.pardot.com ~all

DMARC

Configured
v=DMARC1; p=reject; sp=reject; fo=1; rua=mailto:re+lhqmqj57zra@DMARC.postmarkapp.com,mailto:re+xu5r3a1wrlo@inbound.dmarcdigests.com,mailto:dmarcreports@duolingo.com; ruf=mailto:dmarcreports@duolingo.com; adkim=r; aspf=r

DKIM

Selector google
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCzNuM4gb1XRWRkI3wae2j3rWxEeNf9NkV0QkP7GZQ60sw5RrLfL1IOTMoBO+gaHmbCIN3q+MMvr6IDFDCowE8XXKe+FTeElZygkddZmo2I34I7MkD01A1xSEu/jIsSLzQyo4IgM3s+d+jO6QlsgjK1dovZFA6N3fcxXaR3UoqXZwIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
Duolingo
Description
Duolingo is the world's most popular way to learn a language. It's 100% free, fun and science-based. Practice online on duolingo.com or on the apps!
Final URL
https://www.duolingo.com/
HTTP status
200

HTTP

Status
HTTP/2 200
Final URL
https://www.duolingo.com/
Version
3
Server
duo-api
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Amazon
CN
duolingo.com
Valid from
2025-11-24T18:00:00-06:00
Valid until
2026-12-24T17:59:59-06:00
Days remaining
137
Protocol
TLSv1.2
Cipher
ECDHE-RSA-AES128-GCM-SHA256

Security headers

1 active
—
HSTSNot detected
—
Content Security PolicyNot detected
—
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
100.61.158.178, 50.17.4.40, 52.4.137.170
70,26 ms
Cloudflare
1.1.1.1
100.61.158.178, 50.17.4.40, 52.4.137.170
28,82 ms
Quad9
9.9.9.9
100.61.158.178, 50.17.4.40, 52.4.137.170
42,81 ms
OpenDNS
208.67.222.222
100.61.158.178, 50.17.4.40, 52.4.137.170
27,63 ms
AdGuard
94.140.14.14
100.61.158.178, 50.17.4.40, 52.4.137.170
66,72 ms

IP, geolocation and ASNAssociated network information

50.17.4.40

No data
success
No
country
region
city
asn
organization
isp

52.4.137.170

No data
success
No
country
region
city
asn
organization
isp

100.61.158.178

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

aspmx5.googlemail.com

Port 25: Closed/unreachable - 32.5 ms - 
Port 465: Closed/unreachable - 4043.4 ms - 
Port 587: Closed/unreachable - 4019.9 ms -

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