`professorofhow.com`

DNSSEC	⚠️ Not signed
A	2606:4700:3031::ac43:96c4^{🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3033::6815:bf1^{🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.11.241^{Cloudflare104.21.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.150.196^{🇺🇸 Cloudflare172.67.144.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`jeremy.ns.cloudflare.com` ⭐
		A	2606:4700:58::adf5:3bb4^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`jeremy.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c1b4^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`jeremy.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:21b4^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`jeremy.ns.cloudflare.com`
		A	108.162.193.180^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`jeremy.ns.cloudflare.com`
		A	172.64.33.180^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`jeremy.ns.cloudflare.com`
		A	173.245.59.180^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`jeremy.ns.cloudflare.com`
NS	`teresa.ns.cloudflare.com`
		A	2606:4700:50::a29f:26d8^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`teresa.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c2d8^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`teresa.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:22d8^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`teresa.ns.cloudflare.com`
		A	108.162.194.216^{🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`teresa.ns.cloudflare.com`
		A	162.159.38.216^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`teresa.ns.cloudflare.com`
		A	172.64.34.216^{🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`teresa.ns.cloudflare.com`
MX	`mx2.zoho.in` ⭐
		A	169.148.146.168^{🇮🇳 ZOHO-IN169.148.146.0/24 ZOHO Corporation Private Limited Estancia IT Park GST Road , Vallanchery Village, GST Rd}
			PTR	`mx2.zoho.in`
			PTR	`mx3.zoho.in`
			PTR	`mx.zoho.in`
		A	169.148.149.118^{🇮🇳 ZOHO-IN169.148.148.0/23 ZOHO Corporation Private Limited Estancia IT Park GST Road , Vallanchery Village, GST Rd}
			PTR	`mx2.zoho.in`
			PTR	`mx3.zoho.in`
			PTR	`mx.zoho.in`
MX	`mx3.zoho.in`⁽²⁰⁾
		A	103.103.196.235^{🇮🇳 ZOHO-IN103.103.196.0/23 ZOHO}
			PTR	`mx2.zoho.in`
			PTR	`mx3.zoho.in`
			PTR	`mx.zoho.in`
MX	`mx.zoho.in`⁽⁵⁰⁾
		A	169.148.146.168^{🇮🇳 ZOHO-IN169.148.146.0/24 ZOHO Corporation Private Limited Estancia IT Park GST Road , Vallanchery Village, GST Rd}
			PTR	`mx2.zoho.in`
			PTR	`mx3.zoho.in`
			PTR	`mx.zoho.in`
		A	169.148.149.118^{🇮🇳 ZOHO-IN169.148.148.0/23 ZOHO Corporation Private Limited Estancia IT Park GST Road , Vallanchery Village, GST Rd}
			PTR	`mx2.zoho.in`
			PTR	`mx3.zoho.in`
			PTR	`mx.zoho.in`
TXT	`brevo-code:483533c586614f692ffc0a2f4034ee67`
TXT	`v=spf1 include:zoho.in ~all`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.11.241, 172.67.150.196
		IPv6 hints	2606:4700:3031::ac43:96c4, 2606:4700:3033::6815:bf1
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=17, name=cloudflare-ech.com
SOA	`jeremy.ns.cloudflare.com`dns@cloudflare.com serial=2409511694

`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=1784094052

📈 Tranco rank: #895,833

Same first word

professorofhow.com

DNS History

14 records (9 active, 5 former)

●NSjeremy.ns.cloudflare.com2026-06-11 → 2026-07-15 · 3 obs

○ 2019-12-15 14:40:44
● 2026-06-11 23:42:20
● 2026-07-15 06:04:40

○NSns21.domaincontrol.com2019-12-15 → 2019-12-15 · 3 obs

● 2019-12-15 14:40:44
○ 2026-06-11 23:42:20
○ 2026-07-15 06:04:40

○NSns22.domaincontrol.com2019-12-15 → 2019-12-15 · 3 obs

● 2019-12-15 14:40:44
○ 2026-06-11 23:42:20
○ 2026-07-15 06:04:40

●NSteresa.ns.cloudflare.com2026-06-11 → 2026-07-15 · 3 obs

○ 2019-12-15 14:40:44
● 2026-06-11 23:42:20
● 2026-07-15 06:04:40

●MXmx.zoho.in2026-06-11 → 2026-07-15 · 2 obs

● 2026-06-11 23:42:20
● 2026-07-15 06:04:40

●MXmx2.zoho.in2026-06-11 → 2026-07-15 · 2 obs

● 2026-06-11 23:42:20
● 2026-07-15 06:04:40

●MXmx3.zoho.in2026-06-11 → 2026-07-15 · 2 obs

● 2026-06-11 23:42:20
● 2026-07-15 06:04:40

●A104.21.11.2412026-06-11 → 2026-07-15 · 3 obs

○ 2019-12-15 14:40:44
● 2026-06-11 23:42:20
● 2026-07-15 06:04:40

●A172.67.150.1962026-06-11 → 2026-07-15 · 3 obs

○ 2019-12-15 14:40:44
● 2026-06-11 23:42:20
● 2026-07-15 06:04:40

○A184.168.221.572019-12-15 → 2019-12-15 · 3 obs

● 2019-12-15 14:40:44
○ 2026-06-11 23:42:20
○ 2026-07-15 06:04:40

●A2606:4700:3031::ac43:96c42026-07-04 → 2026-07-15 · 3 obs

○ 2026-06-11 23:42:20
● 2026-07-04 13:54:44
● 2026-07-15 06:04:40

○A2606:4700:3032::ac43:96c42026-06-11 → 2026-06-11 · 4 obs

○ 2019-12-15 14:40:44
● 2026-06-11 23:42:20
○ 2026-07-04 13:54:44
○ 2026-07-15 06:04:40

●A2606:4700:3033::6815:bf12026-07-04 → 2026-07-15 · 3 obs

○ 2026-06-11 23:42:20
● 2026-07-04 13:54:44
● 2026-07-15 06:04:40

○A2606:4700:3037::6815:bf12026-06-11 → 2026-06-11 · 4 obs

○ 2019-12-15 14:40:44
● 2026-06-11 23:42:20
○ 2026-07-04 13:54:44
○ 2026-07-15 06:04:40

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
professorofhow.com	jeremy.ns.cloudflare.com, teresa.ns.cloudflare.com	12 records

✅ Authoritative Response

Server:108.162.194.216

NS records: jeremy.ns.cloudflare.com, teresa.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for professorofhow.com (unsigned zone)

⏱️ Timing

Total: 1766ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.11.241, 172.67.150.196`
AAAA	2	`2606:4700:3033::6815:bf1, 2606:4700:3031::ac43:96c4`
NS	2	`jeremy.ns.cloudflare.com, teresa.ns.cloudflare.com`
MX	3	`mx.zoho.in (pri: 10), mx2.zoho.in (pri: 20)...`
TXT	2	`brevo-code:483533c586614f692ffc0a2f4034e, v=spf1 include:zoho.in ~all`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`jeremy.ns.cloudflare.com dns.cloudflare.`

📌 Glue Records Collected

Total: 12

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

Analysis

IP Addresses

professorofhow.com resolves to four IP addresses: 104.21.11.241, 172.67.150.196, 2606:4700:3031::ac43:96c4 and 2606:4700:3033::6815:bf1.

pzcwisdomuat.com, www.bathtub.com.my, mail.singkansard.com and two other host names share IP numbers with professorofhow.com.

Name Servers

Two name servers handle the delegation for professorofhow.com: jeremy.ns.cloudflare.com and teresa.ns.cloudflare.com.

professorofhow.com uses the same name servers as several other domains — among them meetmix.net, globalresearch.co.jp, diplom-onlinex.com and two more.

professorofhow.com shares at least some of its name servers with other domains, including undied.com, joincheckmate.com, weirfd.org and two others.

These name servers are frequently paired with the name servers jason.ns.cloudflare.com and joyce.ns.cloudflare.com.

Hostnames that resolve to 6 IP addresses:

jeremy.ns.cloudflare.com resolves to 108.162.193.180, 172.64.33.180 and 173.245.59.180 among others, with 3 other IP addresses in total.

teresa.ns.cloudflare.com resolves to 108.162.194.216, 162.159.38.216 and 172.64.34.216 among others, with 3 other IP addresses in total.

Mail Servers

professorofhow.com is handled by three mail servers: mx2.zoho.in, mx3.zoho.in and mx.zoho.in.

professorofhow.com has at least partial mail server overlap with other domains such as greenoranges.co.uk, vanvasi.com, advertolearn.com and two more.

Hostnames that resolve to two IP addresses:

mx2.zoho.in resolves to two addresses: 169.148.146.168 and 169.148.149.118.

mx.zoho.in resolves to two addresses: 169.148.146.168 and 169.148.149.118.

Hosts with just one IP address:

The hostname mx3.zoho.in resolves to 103.103.196.235.

mx2.zoho.in along with mx.zoho.in each resolve to 169.148.146.168 IP addresses.

mx2.zoho.in along with mx.zoho.in each resolve to 169.148.149.118 IP addresses.

professorofhow.com - robtex.com