`flexiclasses.com`

DNSSEC	⚠️ Not signed
A	2606:4700:3030::ac43:dae9^{🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3033::6815:262c^{🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.38.44^{Cloudflare104.21.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.218.233^{🇺🇸 Cloudflare172.67.208.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`athena.ns.cloudflare.com` ⭐
		A	2606:4700:50::adf5:3a48^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`athena.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c048^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`athena.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2048^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`athena.ns.cloudflare.com`
		A	108.162.192.72^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`athena.ns.cloudflare.com`
		A	172.64.32.72^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`athena.ns.cloudflare.com`
		A	173.245.58.72^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`athena.ns.cloudflare.com`
NS	`karl.ns.cloudflare.com`
		A	2606:4700:58::adf5:3bbe^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`karl.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c1be^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`karl.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:21be^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`karl.ns.cloudflare.com`
		A	108.162.193.190^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`karl.ns.cloudflare.com`
		A	172.64.33.190^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`karl.ns.cloudflare.com`
		A	173.245.59.190^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`karl.ns.cloudflare.com`
MX	`mx2.zoho.com` ⭐
		A	136.143.183.44^{🇺🇸 ZohoAS136.143.182.0/23 Zoho}
			PTR	`mx2.zoho.com`
			PTR	`mx3.zoho.com`
			PTR	`mx.zoho.com`
			PTR	`mx2.zohomail.com`
			PTR	`mx3.zohomail.com`
			PTR	`mx.zohomail.com`
MX	`mx3.zoho.com`⁽²⁰⁾
		A	136.143.191.44^{🇺🇸 ZohoAS136.143.190.0/23 Zoho Corporation}
			PTR	`mx2.zoho.com`
			PTR	`mx3.zoho.com`
			PTR	`mx.zoho.com`
			PTR	`mx2.zohomail.com`
			PTR	`mx3.zohomail.com`
			PTR	`mx.zohomail.com`
MX	`mx.zoho.com`⁽⁵⁰⁾
		A	136.143.183.44^{🇺🇸 ZohoAS136.143.182.0/23 Zoho}
			PTR	`mx2.zoho.com`
			PTR	`mx3.zoho.com`
			PTR	`mx.zoho.com`
			PTR	`mx2.zohomail.com`
			PTR	`mx3.zohomail.com`
			PTR	`mx.zohomail.com`
		A	136.143.191.44^{🇺🇸 ZohoAS136.143.190.0/23 Zoho Corporation}
			PTR	`mx2.zoho.com`
			PTR	`mx3.zoho.com`
			PTR	`mx.zoho.com`
			PTR	`mx2.zohomail.com`
			PTR	`mx3.zohomail.com`
			PTR	`mx.zohomail.com`
TXT	`anthropic-domain-verification-s6e5k8=BUHjqTyGMG7c6XIInZv4SOzZF`
TXT	`mailerlite-domain-verification=12c65d366128f643f207c3322e22fa7d2a5b09d3`
TXT	`mailerlite-domain-verification=21438dad975a43e30cdcba2ed63bcb8d53bd9c1c`
TXT	`stripe-verification=8429aa47907add7ca7b28a0ce1a56825175b710e3e568e609aeb2ea31...`
TXT	`v=spf1 include:_spf.mlsend.com include:zoho.com include:spf.mandrillapp.com a...`
TXT	`zoho-verification=zb47532239.zmverify.zoho.com`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.38.44, 172.67.218.233
		IPv6 hints	2606:4700:3030::ac43:dae9, 2606:4700:3033::6815:262c
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=221, name=cloudflare-ech.com
SOA	`athena.ns.cloudflare.com`dns@cloudflare.com serial=2399380204

`com`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.gtld-servers.net` ⭐
	NS	`b.gtld-servers.net`
	NS	`c.gtld-servers.net`
	NS	`d.gtld-servers.net`
	NS	`e.gtld-servers.net`
	NS	`f.gtld-servers.net`
	NS	`g.gtld-servers.net`
	NS	`h.gtld-servers.net`
	NS	`i.gtld-servers.net`
	NS	`j.gtld-servers.net`
	NS	`k.gtld-servers.net`
	NS	`l.gtld-servers.net`
	NS	`m.gtld-servers.net`
	SOA	`a.gtld-servers.net`nstld@verisign-grs.com serial=1776130282

rank #476822 globally
rank #210702 in the tld
📈 Tranco rank: #594,453

Subdomains

study.flexiclasses.com

Same first word

flexiclasses.com

DNS History

21 records (9 active, 12 former)

●NSathena.ns.cloudflare.com2026-03-28 → 2026-04-14 · 3 obs

○ 2018-01-11 06:18:08
● 2026-03-28 11:09:06
● 2026-04-14 01:44:34

●NSkarl.ns.cloudflare.com2026-03-28 → 2026-04-14 · 3 obs

○ 2018-01-11 06:18:08
● 2026-03-28 11:09:06
● 2026-04-14 01:44:34

○NSns1044.ui-dns.biz2018-01-11 → 2018-01-11 · 3 obs

● 2018-01-11 06:18:08
○ 2026-03-28 11:09:06
○ 2026-04-14 01:44:34

○NSns1064.ui-dns.com2018-01-11 → 2018-01-11 · 3 obs

● 2018-01-11 06:18:08
○ 2026-03-28 11:09:06
○ 2026-04-14 01:44:34

○NSns1093.ui-dns.de2018-01-11 → 2018-01-11 · 3 obs

● 2018-01-11 06:18:08
○ 2026-03-28 11:09:06
○ 2026-04-14 01:44:34

○NSns1095.ui-dns.org2018-01-11 → 2018-01-11 · 3 obs

● 2018-01-11 06:18:08
○ 2026-03-28 11:09:06
○ 2026-04-14 01:44:34

●MXmx.zoho.com2026-03-28 → 2026-04-14 · 3 obs

○ 2018-01-11 06:18:08
● 2026-03-28 11:09:06
● 2026-04-14 01:44:34

○MXmx00.1and1.fr2018-01-11 → 2018-01-11 · 3 obs

● 2018-01-11 06:18:08
○ 2026-03-28 11:09:06
○ 2026-04-14 01:44:34

○MXmx01.1and1.fr2018-01-11 → 2018-01-11 · 3 obs

● 2018-01-11 06:18:08
○ 2026-03-28 11:09:06
○ 2026-04-14 01:44:34

●MXmx2.zoho.com2026-03-28 → 2026-04-14 · 3 obs

○ 2018-01-11 06:18:08
● 2026-03-28 11:09:06
● 2026-04-14 01:44:34

●MXmx3.zoho.com2026-03-28 → 2026-04-14 · 3 obs

○ 2018-01-11 06:18:08
● 2026-03-28 11:09:06
● 2026-04-14 01:44:34

●A104.21.38.442026-03-28 → 2026-04-14 · 6 obs

○ 2018-01-11 06:18:08
● 2026-03-28 11:09:06
● 2026-03-28 13:04:38
○ 2026-03-31 03:26:40
○ 2026-04-08 17:53:30
● 2026-04-14 01:44:34

●A172.67.218.2332026-03-28 → 2026-04-14 · 6 obs

○ 2018-01-11 06:18:08
● 2026-03-28 11:09:06
● 2026-03-28 13:04:38
○ 2026-03-31 03:26:40
○ 2026-04-08 17:53:30
● 2026-04-14 01:44:34

○A188.114.96.02026-03-31 → 2026-04-08 · 5 obs

○ 2026-03-28 11:09:06
○ 2026-03-28 13:04:38
● 2026-03-31 03:26:40
● 2026-04-08 17:53:30
○ 2026-04-14 01:44:34

○A188.114.97.02026-03-31 → 2026-04-08 · 5 obs

○ 2026-03-28 11:09:06
○ 2026-03-28 13:04:38
● 2026-03-31 03:26:40
● 2026-04-08 17:53:30
○ 2026-04-14 01:44:34

○A2001:8d8:100f:f000::23d2018-01-11 → 2018-01-11 · 3 obs

● 2018-01-11 06:18:08
○ 2026-03-28 11:09:06
○ 2026-04-14 01:44:34

○A217.160.0.2382018-01-11 → 2018-01-11 · 3 obs

● 2018-01-11 06:18:08
○ 2026-03-28 11:09:06
○ 2026-04-14 01:44:34

●A2606:4700:3030::ac43:dae92026-03-28 → 2026-04-14 · 6 obs

○ 2018-01-11 06:18:08
● 2026-03-28 11:09:06
● 2026-03-28 13:04:38
○ 2026-03-31 03:26:40
○ 2026-04-08 17:53:30
● 2026-04-14 01:44:34

●A2606:4700:3033::6815:262c2026-03-28 → 2026-04-14 · 6 obs

○ 2018-01-11 06:18:08
● 2026-03-28 11:09:06
● 2026-03-28 13:04:38
○ 2026-03-31 03:26:40
○ 2026-04-08 17:53:30
● 2026-04-14 01:44:34

○A2a06:98c1:3120::2026-03-31 → 2026-04-08 · 5 obs

○ 2026-03-28 11:09:06
○ 2026-03-28 13:04:38
● 2026-03-31 03:26:40
● 2026-04-08 17:53:30
○ 2026-04-14 01:44:34

○A2a06:98c1:3121::2026-03-31 → 2026-04-08 · 5 obs

○ 2026-03-28 11:09:06
○ 2026-03-28 13:04:38
● 2026-03-31 03:26:40
● 2026-04-08 17:53:30
○ 2026-04-14 01:44:34

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	h.gtld-servers.net, m.gtld-servers.net, g.gtld-servers.net, k.gtld-servers.net...	-
flexiclasses.com	athena.ns.cloudflare.com, karl.ns.cloudflare.com	12 records

✅ Authoritative Response

Server:108.162.193.190

NS records: athena.ns.cloudflare.com, karl.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for flexiclasses.com (unsigned zone)

⏱️ Timing

Total: 272ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.38.44, 172.67.218.233`
AAAA	2	`2606:4700:3030::ac43:dae9, 2606:4700:3033::6815:262c`
NS	2	`athena.ns.cloudflare.com, karl.ns.cloudflare.com`
MX	3	`mx.zoho.com (pri: 10), mx2.zoho.com (pri: 20)...`
TXT	6	`anthropic-domain-verification-s6e5k8=BUH, mailerlite-domain-verification=12c65d366...`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`athena.ns.cloudflare.com dns.cloudflare.`

📌 Glue Records Collected

Total: 12

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

Analysis

Hierarchy

study.flexiclasses.com is a child of flexiclasses.com.

IP Addresses

flexiclasses.com refers to four IP numbers: 2606:4700:3030::ac43:dae9, 2606:4700:3033::6815:262c, 104.21.38.44 and 172.67.218.233.

Other host names, for instance cytokinesociety.org, www.snqc.org, travelnet.space, spinukblog.co.uk and yoyajewelry.com share IP numbers with flexiclasses.com.

Name Servers

flexiclasses.com's delegation uses two name servers: athena.ns.cloudflare.com and karl.ns.cloudflare.com.

flexiclasses.com uses the same name server setup as other domains, such as xin888b.com, 13286102867.vip, balon4dabc.com, xin507.com and enrgc.com.

flexiclasses.com at least partially shares name servers with other domains, including xtrons.co.jp, yellowjokes.com, cirluna.nl, bclaser.ca and dowabagonline.com.

These name servers are commonly used with rocco.ns.cloudflare.com.

Host names with six IP numbers:

athena.ns.cloudflare.com points to 2606:4700:50::adf5:3a48, 2803:f800:50::6ca2:c048, 2a06:98c1:50::ac40:2048, 108.162.192.72, 172.64.32.72 and 173.245.58.72.

karl.ns.cloudflare.com points to 2606:4700:58::adf5:3bbe, 2803:f800:50::6ca2:c1be, 2a06:98c1:50::ac40:21be, 108.162.193.190, 172.64.33.190 and 173.245.59.190.

Mail Servers

Three mail servers handle flexiclasses.com: mx2.zoho.com, mx3.zoho.com and mx.zoho.com.

flexiclasses.com shares at least some mail servers with other domains, for example hypal.eu, mysuitemex.com, ortigialiving.com, aiduia.org and i-condor.com.