`help.supermemo.org`

DNSSEC	⚠️ Not signed
A	2606:4700:3032::6815:20a0^{🇺🇸 Cloudflare2606:4700:3032::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3032::ac43:98dd^{🇺🇸 Cloudflare2606:4700:3032::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.32.160^{Cloudflare104.21.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.152.221^{🇺🇸 Cloudflare172.67.144.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4	104.21.32.160, 172.67.152.221
		IPv6	2606:4700:3032::6815:20a0, 2606:4700:3032::ac43:98dd

`supermemo.org`

	DNSSEC	⚠️ Not signed
	A	209.124.66.20^{🇺🇸 A2HOSTING209.124.66.0/23 SITEPROTECT}
	NS	`aitana.ns.cloudflare.com` ⭐
	NS	`andronicus.ns.cloudflare.com`
	MX	`mail.supermemo.org` ⭐
	TXT	`v=spf1 +a +mx +ip4:209.124.66.20 include:spf.a2hosting.com ~all`
	SOA	`aitana.ns.cloudflare.com`dns@cloudflare.com serial=2399184527

WOT: SAFE (65/100)

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DNS History

5 records (4 active, 1 former)

●A104.21.32.1602026-02-15 → 2026-03-22 · 3 obs

○ 2016-06-20 06:56:40
● 2026-02-15 05:18:26
● 2026-03-22 22:25:48

●A172.67.152.2212026-02-15 → 2026-03-22 · 3 obs

○ 2016-06-20 06:56:40
● 2026-02-15 05:18:26
● 2026-03-22 22:25:48

●A2606:4700:3032::6815:20a02026-02-15 → 2026-03-22 · 3 obs

○ 2016-06-20 06:56:40
● 2026-02-15 05:18:26
● 2026-03-22 22:25:48

●A2606:4700:3032::ac43:98dd2026-02-15 → 2026-03-22 · 3 obs

○ 2016-06-20 06:56:40
● 2026-02-15 05:18:26
● 2026-03-22 22:25:48

○A67.210.109.2302015-07-19 → 2016-06-20 · 4 obs

● 2015-07-19 04:41:44
● 2016-06-20 06:56:40
○ 2026-02-15 05:18:26
○ 2026-03-22 22:25:48

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
org	b2.org.afilias-nst.org, d0.org.afilias-nst.org, b0.org.afilias-nst.org	-
supermemo.org	aitana.ns.cloudflare.com, andronicus.ns.cloudflare.com	-

✅ Authoritative Response

Server: 108.162.195.113

NS records: aitana.ns.cloudflare.com, andronicus.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for supermemo.org (unsigned zone)

⏱️ Timing

Total: 325ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.152.221, 104.21.32.160`
AAAA	2	`2606:4700:3032::6815:20a0, 2606:4700:3032::ac43:98dd`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`

Analysis

IP Addresses

help.supermemo.org maps to four IP numbers: 2606:4700:3032::6815:20a0, 2606:4700:3032::ac43:98dd, 104.21.32.160 and 172.67.152.221.

Other host names, for instance choicedekho.com, agmo.group, echoukonline.co.uk, szf168.com and www.lustmaza.study share IP numbers with help.supermemo.org.

help.supermemo.org - robtex.com