dev.duolingo.com - dns.ninja

`dev.duolingo.com`

DNSSEC	⚠️ Not signed
NS	`ns-1067.awsdns-05.org` ⭐
		A	2600:9000:5304:2b00::1^{🇺🇸 Amazon2600:9000:5304::/48 - CloudFront}
			PTR	`ns-1067.awsdns-05.org`
		A	205.251.196.43^{🇺🇸 Amazon205.251.196.0/24 prefix}
			PTR	`ns-1067.awsdns-05.org`
NS	`ns-2035.awsdns-62.co.uk`
		A	2600:9000:5307:f300::1^{🇺🇸 Amazon2600:9000:5307::/48 - CloudFront}
			PTR	`ns-2035.awsdns-62.co.uk`
		A	205.251.199.243^{🇺🇸 Amazon205.251.199.0/24 prefix}
			PTR	`ns-2035.awsdns-62.co.uk`
NS	`ns-254.awsdns-31.com`
		A	2600:9000:5300:fe00::1^{🇺🇸 Amazon2600:9000:5300::/48 - CloudFront}
			PTR	`ns-254.awsdns-31.com`
		A	205.251.192.254^{🇺🇸 Amazon205.251.192.0/24 prefix}
			PTR	`ns-254.awsdns-31.com`
NS	`ns-759.awsdns-30.net`
		A	2600:9000:5302:f700::1^{🇺🇸 Amazon2600:9000:5302::/48 - CloudFront}
			PTR	`ns-759.awsdns-30.net`
		A	205.251.194.247^{🇺🇸 Amazon205.251.194.0/24 prefix}
			PTR	`ns-759.awsdns-30.net`
SOA	`ns-1067.awsdns-05.org`awsdns-hostmaster@amazon.com serial=1

`duolingo.com`

	DNSSEC	⚠️ Not signed
	A	3.88.96.65^{🇺🇸 Amazon3.80.0.0/12 EC2 IAD prefix}
	A	32.194.249.229
	A	32.198.200.164
	NS	`ns-1020.awsdns-63.net` ⭐
	NS	`ns-1117.awsdns-11.org`
	NS	`ns-1904.awsdns-46.co.uk`
	NS	`ns-247.awsdns-30.com`
	MX	`aspmx.l.google.com` ⭐
	MX	`alt1.aspmx.l.google.com`⁽²⁰⁾
	MX	`alt2.aspmx.l.google.com`⁽²⁰⁾
	MX	`aspmx2.googlemail.com`⁽³⁰⁾
	MX	`aspmx3.googlemail.com`⁽³⁰⁾
	MX	`aspmx4.googlemail.com`⁽³⁰⁾
	MX	`aspmx5.googlemail.com`⁽³⁰⁾
	TXT	`MS=ms66530579`
	TXT	`_vg2bua41v8x489g1y55hg3hr4h3qmj0`
	TXT	`aliyun-site-verification=1acfc148-50be-45c8-a021-3c933fc8eff9`
	TXT	`amazonses:+SIz2NZPqYri3C+PSIyKShZIbuI4rNpbLlES7lmvpu4=`
	TXT	`anthropic-domain-verification-z4335b=YssTBALPY7K784Sri4FjVHjd3`
	TXT	`apple-domain-verification=bMPI889zOgALUenN`
	TXT	`atlassian-sending-domain-verification=423a5faf-1cfa-4704-a38a-f7adae302dd6`
	TXT	`docker-verification=b4ead4c5-fd66-42a5-a684-8f2e7f4c1417`
	TXT	`e622flctk14s3cs3ccdauh8uth`
	TXT	`google-site-verification=975UaH3lkKONB88HjWDDg34p8cdCqyTVSq_KGBAXrmU`
	TXT	`h1-domain-verification=sjPBeaGqQwEe8YhJ3W8JVNJa7WDQFAzc6AHkURoErkh324Yy`
	TXT	`jetbrains-domain-verification=bt8q7duih10l9pmf5fo5yy8wf`
	TXT	`klaviyo-site-verification=RKdcF3`
	TXT	`klaviyo-site-verification=TGmZS7`
	TXT	`openai-domain-verification=dv-A4cFxdrYIEodfG6UiQU0qxnT`
	TXT	`openai-domain-verification=dv-ieCpefZUqvVQwb8f7o4SlFye`
	TXT	`pardot_208162_*=610bfb45f202232a79db94c298b30d14332a62a6894e695b025fa7949d7b03fa`
	TXT	`pardot_208162_*=c15d5cb1b9f31e26058e1f30bda9e5d65c57cfeea37b34af8e1dd88474460e90`
	TXT	`rippling-domain-verification=9692f0635321f04d`
	TXT	`slack-domain-verification=iuNWYimCCkEpnistAJvWc4YOZF8izoZ23TCDek0I`
	TXT	`spacelift-domain-verification=519xtPXm`
	TXT	`stripe-verification=c8d270a115adc8c5a0a84fb24e17b7d05f66aad648d01e86f15548c6d...`
	TXT	`v=spf1 ip4:100.25.59.11 ip4:205.201.128.0/20 ip4:198.2.128.0/18 ip4:148.105.8...`
	SOA	`ns-1020.awsdns-63.net`awsdns-hostmaster@amazon.com serial=1

WOT: SAFE (95/100)
rank #1144 globally
rank #632 in the tld
Semrush Rank:#1,342 Keywords:317,627 Traffic:1,988,874/mo
WOT: SAFE (95/100)
📈 Tranco rank: #477

Duolingo is the world's most popular language learning platform, founded in 2011 by Luis von Ahn and Severin Hacker. With over 500 million registered users, Duolingo has made language learning accessible through gamification. The company went public in 2021.

The platform offers courses in over 40 languages through a game-like interface with lessons, streaks, and leaderboards. Duolingo has expanded into Duolingo English Test and Duolingo Math.

Duolingo's infrastructure handles millions of daily lessons with sophisticated adaptive learning algorithms and extensive A/B testing.

DNS for duolingo.com uses Amazon Route 53 with global distribution. The platform's mobile apps and web interface are optimized for diverse network conditions.

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DNS History

5 records (4 active, 1 former)

●NSns-1067.awsdns-05.org2026-05-19 → 2026-08-15 · 2 obs

● 2026-05-19 19:49:08
● 2026-08-15 04:47:08

●NSns-2035.awsdns-62.co.uk2026-05-19 → 2026-08-15 · 2 obs

● 2026-05-19 19:49:08
● 2026-08-15 04:47:08

●NSns-254.awsdns-31.com2026-05-19 → 2026-08-15 · 2 obs

● 2026-05-19 19:49:08
● 2026-08-15 04:47:08

●NSns-759.awsdns-30.net2026-05-19 → 2026-08-15 · 2 obs

● 2026-05-19 19:49:08
● 2026-08-15 04:47:08

○A54.165.40.1362019-04-25 → 2019-04-25 · 4 obs

● 2019-04-25 13:41:22
● 2019-04-25 13:42:16
○ 2026-05-19 19:49:08
○ 2026-08-15 04:47:08

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
duolingo.com	ns-247.awsdns-30.com, ns-1020.awsdns-63.net, ns-1117.awsdns-11.org, ns-1904.awsdns-46.co.uk	2 records
dev.duolingo.com	ns-1067.awsdns-05.org, ns-2035.awsdns-62.co.uk, ns-254.awsdns-31.com, ns-759.awsdns-30.net	-

✅ Authoritative Response

Server:205.251.196.43

NS records: ns-1067.awsdns-05.org, ns-2035.awsdns-62.co.uk, ns-254.awsdns-31.com, ns-759.awsdns-30.net

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for duolingo.com (unsigned zone)

⏱️ Timing

Total: 475ms | Queries: -

📄 Records

Type	Count	Sample Data
NS	4	`ns-1067.awsdns-05.org, ns-2035.awsdns-62.co.uk...`
SOA	1	`ns-1067.awsdns-05.org awsdns-hostmaster.`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns-247.awsdns-30.com, ns-247.awsdns-30.com)

Analysis

Name Servers

The domain dev.duolingo.com is delegated to these four name servers: ns-254.awsdns-31.com, ns-759.awsdns-30.net, ns-1067.awsdns-05.org and ns-2035.awsdns-62.co.uk.

dev.duolingo.com shares at least some of its name servers with other domains, including marriottnewscenter.com, communitywfm.com, pupillage.com and two others.

The host names ns-254.awsdns-31.com, ns-759.awsdns-30.net, ns-1067.awsdns-05.org and ns-2035.awsdns-62.co.uk each resolve to two IP addresses: ns-254.awsdns-31.com resolves to 205.251.192.254 and 2600:9000:5300:fe00::1; ns-759.awsdns-30.net resolves to 205.251.194.247 and 2600:9000:5302:f700::1; ns-1067.awsdns-05.org resolves to 205.251.196.43 and 2600:9000:5304:2b00::1; ns-2035.awsdns-62.co.uk resolves to 205.251.199.243 and 2600:9000:5307:f300::1.