mail.mathematicolympiad.com - robtex.com

mail.mathematicolympiad.com

DNSSEC⚠️ Not signed
A2606:4700:3032::ac43:c7ab🇺🇸 Cloudflare2606:4700:3032::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3033::6815:15b1🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.21.177Cloudflare104.21.16.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.199.171🇺🇸 Cloudflare172.67.192.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.21.177, 172.67.199.171
IPv6 hints2606:4700:3032::ac43:c7ab, 2606:4700:3033::6815:15b1
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=153, name=cloudflare-ech.com

mathematicolympiad.com

DNSSEC⚠️ Not signed
A2606:4700:3032::ac43:c7ab🇺🇸 Cloudflare2606:4700:3032::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3033::6815:15b1🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.21.177Cloudflare104.21.16.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.199.171🇺🇸 Cloudflare172.67.192.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NSdiana.ns.cloudflare.com ⭐
NSzac.ns.cloudflare.com
MXmail--server.net ⭐
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.21.177, 172.67.199.171
IPv6 hints2606:4700:3032::ac43:c7ab, 2606:4700:3033::6815:15b1
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=153, name=cloudflare-ech.com
SOAdiana.ns.cloudflare.comdns@cloudflare.com serial=2402554922

Previously MX for

mathematicolympiad.com

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DNS History

5 records (4 active, 1 former)

2020202120222023202420252026A104.21.21.177172.67.199.1712606:4700:3032::ac43:c7ab2606:4700:3033::6815:15b1185.141.60.9
●A104.21.21.1772026-04-30 → 2026-05-11 · 3 obs
○ 2019-12-19 15:09:14
● 2026-04-30 13:20:42
● 2026-05-11 17:10:14
●A172.67.199.1712026-04-30 → 2026-05-11 · 3 obs
○ 2019-12-19 15:09:14
● 2026-04-30 13:20:42
● 2026-05-11 17:10:14
○A185.141.60.92019-12-19 → 2019-12-19 · 3 obs
● 2019-12-19 15:09:14
○ 2026-04-30 13:20:42
○ 2026-05-11 17:10:14
●A2606:4700:3032::ac43:c7ab2026-04-30 → 2026-05-11 · 3 obs
○ 2019-12-19 15:09:14
● 2026-04-30 13:20:42
● 2026-05-11 17:10:14
●A2606:4700:3033::6815:15b12026-04-30 → 2026-05-11 · 3 obs
○ 2019-12-19 15:09:14
● 2026-04-30 13:20:42
● 2026-05-11 17:10:14

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
coma.gtld-servers.net, b.gtld-servers.net, f.gtld-servers.net, j.gtld-servers.net...-
mathematicolympiad.comdiana.ns.cloudflare.com, zac.ns.cloudflare.com12 records

✅ Authoritative Response

Server:108.162.194.23

NS records: diana.ns.cloudflare.com, zac.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for mathematicolympiad.com (unsigned zone)

⏱️ Timing

Total: 193ms | Queries: -

📄 Records

TypeCountSample Data
A2104.21.21.177, 172.67.199.171
AAAA22606:4700:3032::ac43:c7ab, 2606:4700:3033::6815:15b1
HTTPS1{"priority":1,"target":".","alpn":["h3",

📌 Glue Records Collected

Total: 12

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

Analysis

IP Addresses

mail.mathematicolympiad.com maps to four IP numbers: 2606:4700:3032::ac43:c7ab, 2606:4700:3033::6815:15b1, 104.21.21.177 and 172.67.199.171.

other host names include cgchannel.com.cn, chorioretinalyst.com, installatielogistiek.nl, powersites.com and fredericdeleuse.fr; they share IP numbers with mail.mathematicolympiad.com.