DNS Report: duolingo.com

Generated: 2026-08-08T20:31:43-05:00

80/100

Diagnostics

StatusCheckPointsDetails
OKIPv4 (A)30/303 IPv4 address(es) detected.
ERRORIPv6 (AAAA)0/100 IPv6 address(es) detected.
OKName server redundancy20/204 NS record(s); 2 or more required.
OKSOA record10/10Authoritative zone record.
ERRORDNSSEC chain0/15Both DS and DNSKEY are required.
ERRORCAA policy0/5Certificate authority restriction.
OKDNS propagation10/10Agreement between public resolvers.
OKMX records20/207 MX record(s).
OKSPF25/25SPF policy published.
OKDMARC25/25DMARC policy published.
OKDKIM20/20A DKIM selector was verified.
ERRORMTA-STS0/5Mail transport policy.
ERRORTLS-RPT0/5TLS reporting policy.
OKValid TLS certificate55/55137 day(s) remaining.
OKCertificate lifetime10/10Full points require at least 30 days remaining.
WARNINGHTTP security headers4/351 of 9 evaluated headers detected.
OKPTR reverse DNS30/30PTR: ec2-50-17-4-40.compute-1.amazonaws.com
OKIPv4 diversity35/35Two or more IPv4 addresses receive full points.
ERRORIPv6 connectivity0/35AAAA availability.
OKDNS resolution40/40At least one address family must resolve.
OKHTTP response40/40HTTP/2 200
OKHTTPS final URL20/20Final URL uses HTTPS.

DNS Records

TipoValues
A
50.17.4.40
52.4.137.170
100.61.158.178
AAAA
CNAME
MX
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
"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
ns-247.awsdns-30.com.
ns-1117.awsdns-11.org.
ns-1904.awsdns-46.co.uk.
ns-1020.awsdns-63.net.
SOA
ns-1020.awsdns-63.net. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
CAA
DS
DNSKEY
RRSIG
NSEC
NSEC3
SRV
NAPTR
TLSA
SSHFP