`mail.duok.com`

DNSSEC	⚠️ Not signed
A	217.76.128.122^{🇪🇸 IONOS-AS217.76.128.0/19 arsys.es}
		PTR	`llca636-a.servidoresdns.net`

`duok.com`

DNSSEC	⚠️ Not signed
A	2606:4700:3033::6815:dfa^{🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3037::ac43:858f^{🇺🇸 Cloudflare2606:4700:3037::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.13.250^{Cloudflare104.21.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.133.143^{🇺🇸 Cloudflare172.67.128.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`eric.ns.cloudflare.com` ⭐
NS	`isla.ns.cloudflare.com`
MX	`duok-com.mail.protection.outlook.com` ⭐
TXT	`bw=EUkzDlmKtyCFKbp6NpCcYqzrnaw61xTVaXNtF4F0SaZA`
TXT	`duo_sso_verification=oiNyqwUBNLfY6tXsjjnjn07HMfkYNpL8YZRICiuvH1TN8iQ7tNJfHgIx...`
TXT	`mailerlite-domain-verification=c0c5da571a9aead4793c643dc40a51692fd78516`
TXT	`sophos-domain-verification=28797a9c6f00807952125d4422a116d974e9c6c1b0c6690fb3...`
TXT	`sophos-domain-verification=5f68370aa2427579adfd9f46023e5e19f38467bb4a7646454f...`
TXT	`v=spf1 include:_spf.maileroo.com include:servers.mcsv.net include:spf.protect...`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.13.250, 172.67.133.143
		IPv6 hints	2606:4700:3033::6815:dfa, 2606:4700:3037::ac43:858f
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=202, name=cloudflare-ech.com
SOA	`eric.ns.cloudflare.com`dns@cloudflare.com serial=2403720978

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DNS History

1 record (1 active, 0 former)

●A217.76.128.1222020-04-14 → 2026-05-15 · 2 obs

● 2020-04-14 21:15:36
● 2026-05-15 09:05:38

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	m.gtld-servers.net, f.gtld-servers.net, h.gtld-servers.net, j.gtld-servers.net...	-
duok.com	eric.ns.cloudflare.com, isla.ns.cloudflare.com	12 records

✅ Authoritative Response

Server:108.162.193.112

NS records: eric.ns.cloudflare.com, isla.ns.cloudflare.com

🔒 DNSSEC Status

🔐 Secure (DNSSEC validated)

Chain of trust verified from root to domain

⏱️ Timing

Total: 163ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`217.76.128.122`

📌 Glue Records Collected

Total: 12

Out-of-bailiwick: 12 (eric.ns.cloudflare.com, eric.ns.cloudflare.com, eric.ns.cloudflare.com...)

Analysis

IP Addresses

mail.duok.com points to a single IP address: 217.76.128.122.

Other host names such as mail.hiqsolutions.com, llca636-a.servidoresdns.net, mail.infoisla.org, mail.frutasesther.es and mail.escolanauticallevantblau.com share IP numbers with mail.duok.com.

mail.duok.com - robtex.com

mail.duok.com

duok.com