mail.duo.su - robtex.com

mail.duo.su

CNAMEdomain.mail.yandex.net
CNAMEmail.yandex.ru
DNSSEC⚠️ Not signed
A2a02:6b8::a4🇷🇺 TELETECH2a02:6b8::/32 Yandex network
PTRmail-yandex-ru-production-external.stable.qloud-b.yandex.net
A77.88.21.37🇷🇺 TELETECH77.88.0.0/18 Yandex enterprise network
NSns3.yandex.ru ⭐
A2a02:6b8::1001🇷🇺 TELETECH2a02:6b8::/32 Yandex network
PTRns3.yandex.ru
A87.250.250.1🇷🇺 TELETECH87.250.224.0/19 Yandex network
PTRns3.yandex.ru
NSns4.yandex.ru
A2a02:6b8:0:1::1:1🇷🇺 TELETECH2a02:6b8::/32 Yandex network
PTRns4.yandex.ru
A77.88.21.1🇷🇺 TELETECH77.88.0.0/18 Yandex enterprise network
PTRns4.yandex.ru
MXmx.yandex.ru ⭐
A2a02:6b8::311🇷🇺 TELETECH2a02:6b8::/32 Yandex network
PTRmxfront.stable.qloud-b.yandex.net
A77.88.21.249🇷🇺 TELETECH77.88.0.0/18 Yandex enterprise network
PTRmxfront.stable.qloud-b.yandex.net
TXTmailru-verification: de5e58bac797a76d
TXTv=spf1 redirect=_spf.yandex.net
TXTyandex-verification: bee56b4396205cc2
TXTgoogle-site-verification=nDqpeshiROB8mM_RiyqO01xkpebe6eiweTxpX6vx8lk
SOAns3.yandex.rusysadmin@yandex.ru serial=1778572477

duo.su

DNSSEC⚠️ Not signed
NSdns1.yandex.net ⭐
NSdns2.yandex.net
MXmx.yandex.net ⭐
TXTv=spf1 redirect=_spf.yandex.net
SOAdns1.yandex.netdns-hosting@yandex.ru serial=5

Previously MX for

duo.su

Same first word

mail.myjino.ru
mail.space
mail.net.ph
mail.rr.gov.br
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mail.ilovecollege.info
mail.gmx
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mail.holiday
mail.zombie.jp
mail.ma
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mail.hashbang.sh
mail.mil.ru
mail.schwarz
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mail.net.mk
mail.rj.gov.br
mail.freedesktop.org
mail.direct
mail.yandex
mail.sh.cn
mail.vacations
mail.my
mail.gov.mz
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mail.veterinaire.fr
mail.ee
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mail.nflfan.org
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mail.ai
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mail.qualifioapp.com
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mail.mods.jp
mail.online
mail.ras.ru
mail.ls
mail.app
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mail.rv.ua
mail.ox.rs
mail.idv.tw
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DNS History

2 records (1 active, 1 former)

2017201820192020202120222023202420252026A213.251.197.77CNAMEdomain.mail.yandex.net
○A213.251.197.772016-04-29 → 2017-01-09 · 4 obs
● 2016-04-29 04:25:12
● 2017-01-09 10:43:58
○ 2026-05-10 00:09:02
○ 2026-05-12 07:54:38
●CNAMEdomain.mail.yandex.net2026-05-10 → 2026-05-12 · 2 obs
● 2026-05-10 00:09:02
● 2026-05-12 07:54:38

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
sua.dns.ripn.net, f.dns.ripn.net, d.dns.ripn.net, b.dns.ripn.net...-
duo.sudns1.yandex.net, dns2.yandex.net-

✅ Authoritative Response

Server:93.158.134.213

NS records: dns1.yandex.net, dns2.yandex.net

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for duo.su (unsigned zone)

⏱️ Timing

Total: 1331ms | Queries: -

📄 Records

TypeCountSample Data
CNAME1domain.mail.yandex.net

Analysis

IP Addresses

mail.duo.su points to two IP numbers: 2a02:6b8::a4 and 77.88.21.37.

Other host names such as tempkorea.com, mail.technodreamscreation.com, mail.yandex.by, nym.be and mail.yandex.az share IPs with mail.duo.su.

Name Servers

mail.duo.su is delegated to two name servers: ns3.yandex.ru and ns4.yandex.ru.

mail.duo.su shares the same name server setup as 255.255.5.in-addr.arpa, 241.108.95.in-addr.arpa, 9.2.4.1.0.0.0.0.8.b.6.0.2.0.a.2.ip6.arpa, 249.108.95.in-addr.arpa and go.yandex.ru.

mail.duo.su shares name servers with other domains at least partially, for instance qloud.yandex-team.ru and qloud.yandex.ru.

These name servers are commonly used with ns5.yandex.ru and ns6.yandex.ru.

Host names with two IP numbers: ns3.yandex.ru points to: 2a02:6b8::1001 and 87.250.250.1; ns4.yandex.ru points to: 2a02:6b8:0:1::1:1 and 77.88.21.1.

Mail Servers

mail.duo.su is handled by a single mail server, mx.yandex.ru.

The mail server setup for mail.duo.su matches that of other domains, for instance fidget.ru, 32-32.ru, vkursi.com, diagonal.ru and leotard.ru.

mail.duo.su shares at least partially some mail servers with other domains, including kstrostov.ru, zigibu.ru, tapioca.cbs.kz, maksnet.ru and matrix-1c.ru.

these mail servers are commonly used together with mx.yandex.net.

mx.yandex.ru points to two IPs: 2a02:6b8::311 and 77.88.21.249.