`h3co.com`

DNSSEC	⚠️ Not signed
A	2606:4700:3030::ac43:aa03^{🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3031::6815:36fd^{🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.54.253^{Cloudflare104.21.48.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.170.3^{🇺🇸 Cloudflare172.67.160.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`carioca.ns.cloudflare.com` ⭐
		A	2606:4700:50::a29f:2614^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`carioca.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c214^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`carioca.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2214^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`carioca.ns.cloudflare.com`
		A	108.162.194.20^{🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`carioca.ns.cloudflare.com`
		A	162.159.38.20^{Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`carioca.ns.cloudflare.com`
		A	172.64.34.20^{🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`carioca.ns.cloudflare.com`
NS	`frank.ns.cloudflare.com`
		A	2606:4700:58::adf5:3ba6^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`frank.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c1a6^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`frank.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:21a6^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`frank.ns.cloudflare.com`
		A	108.162.193.166^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`frank.ns.cloudflare.com`
		A	172.64.33.166^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`frank.ns.cloudflare.com`
		A	173.245.59.166^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`frank.ns.cloudflare.com`
MX	`usb-smtp-inbound-1.mimecast.com` ⭐
		A	170.10.150.242^{🇺🇸 Mimecast-NA170.10.150.0/24 Mimecast NA}
			PTR	`usb-smtp-delivery-2.mimecast.com`
		A	170.10.152.242^{🇺🇸 Mimecast-NA170.10.152.0/24 Mimecast NA}
			PTR	`usb-smtp-delivery-2.mimecast.com`
MX	`usb-smtp-inbound-2.mimecast.com` ⭐
		A	170.10.150.242^{🇺🇸 Mimecast-NA170.10.150.0/24 Mimecast NA}
			PTR	`usb-smtp-delivery-2.mimecast.com`
		A	170.10.152.242^{🇺🇸 Mimecast-NA170.10.152.0/24 Mimecast NA}
			PTR	`usb-smtp-delivery-2.mimecast.com`
TXT	`0ed1fe018a39dade9e833a4cf4b92f6f`
TXT	`MS=ms44812597`
TXT	`anthropic-domain-verification-pjv10v=qYfNDvKrU7zE4V49MwQ3JWUit`
TXT	`google-site-verification=rH9E0d5DOwHod4sUJaM0p8dlAG0jk8rCeWwx9-L0Wvs`
TXT	`v=spf1 include:spf.protection.outlook.com include:usb._netblocks.mimecast.com...`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.54.253, 172.67.170.3
		IPv6 hints	2606:4700:3030::ac43:aa03, 2606:4700:3031::6815:36fd
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=247, name=cloudflare-ech.com
SOA	`carioca.ns.cloudflare.com`dns@cloudflare.com serial=2407820684

`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=1784159272

Same first word

h3co.com

Similar names

och3.org.uk

3hco.com

hoc3.org

DNS History

18 records (8 active, 10 former)

●NScarioca.ns.cloudflare.com2026-07-07 → 2026-07-16 · 3 obs

○ 2018-01-02 23:48:20
● 2026-07-07 12:21:32
● 2026-07-16 00:10:34

●NSfrank.ns.cloudflare.com2026-07-07 → 2026-07-16 · 3 obs

○ 2018-01-02 23:48:20
● 2026-07-07 12:21:32
● 2026-07-16 00:10:34

○NSns21.vinad.com2016-12-15 → 2016-12-15 · 3 obs

● 2016-12-15 19:25:04
○ 2018-01-02 23:48:20
○ 2026-07-16 00:10:34

○NSns22.vinad.com2016-12-15 → 2016-12-15 · 3 obs

● 2016-12-15 19:25:04
○ 2018-01-02 23:48:20
○ 2026-07-16 00:10:34

○NSns23.vinad.com2016-12-15 → 2016-12-15 · 3 obs

● 2016-12-15 19:25:04
○ 2018-01-02 23:48:20
○ 2026-07-16 00:10:34

○NSns24.vinad.com2016-12-15 → 2016-12-15 · 3 obs

● 2016-12-15 19:25:04
○ 2018-01-02 23:48:20
○ 2026-07-16 00:10:34

○NSns3.epik.com2018-01-02 → 2018-01-02 · 4 obs

○ 2016-12-15 19:25:04
● 2018-01-02 23:48:20
○ 2026-07-07 12:21:32
○ 2026-07-16 00:10:34

○NSns4.epik.com2018-01-02 → 2018-01-02 · 4 obs

○ 2016-12-15 19:25:04
● 2018-01-02 23:48:20
○ 2026-07-07 12:21:32
○ 2026-07-16 00:10:34

○MXmail.b-io.co2018-01-02 → 2018-01-02 · 4 obs

○ 2016-12-15 19:25:04
● 2018-01-02 23:48:20
○ 2026-07-07 12:21:32
○ 2026-07-16 00:10:34

○MXmail.h3co.com2016-12-15 → 2016-12-15 · 3 obs

● 2016-12-15 19:25:04
○ 2018-01-02 23:48:20
○ 2026-07-16 00:10:34

●MXusb-smtp-inbound-1.mimecast.com2026-07-07 → 2026-07-16 · 3 obs

○ 2018-01-02 23:48:20
● 2026-07-07 12:21:32
● 2026-07-16 00:10:34

●MXusb-smtp-inbound-2.mimecast.com2026-07-07 → 2026-07-16 · 3 obs

○ 2018-01-02 23:48:20
● 2026-07-07 12:21:32
● 2026-07-16 00:10:34

●A104.21.54.2532026-07-07 → 2026-07-16 · 3 obs

○ 2018-01-02 23:48:20
● 2026-07-07 12:21:32
● 2026-07-16 00:10:34

○A125.212.226.1822016-12-15 → 2016-12-15 · 3 obs

● 2016-12-15 19:25:04
○ 2018-01-02 23:48:20
○ 2026-07-16 00:10:34

●A172.67.170.32026-07-07 → 2026-07-16 · 3 obs

○ 2018-01-02 23:48:20
● 2026-07-07 12:21:32
● 2026-07-16 00:10:34

●A2606:4700:3030::ac43:aa032026-07-07 → 2026-07-16 · 3 obs

○ 2018-01-02 23:48:20
● 2026-07-07 12:21:32
● 2026-07-16 00:10:34

●A2606:4700:3031::6815:36fd2026-07-07 → 2026-07-16 · 3 obs

○ 2018-01-02 23:48:20
● 2026-07-07 12:21:32
● 2026-07-16 00:10:34

○A88.214.207.962018-01-02 → 2018-01-02 · 4 obs

○ 2016-12-15 19:25:04
● 2018-01-02 23:48:20
○ 2026-07-07 12:21:32
○ 2026-07-16 00:10:34

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
h3co.com	frank.ns.cloudflare.com, carioca.ns.cloudflare.com	12 records

✅ Authoritative Response

Server:108.162.193.166

NS records: frank.ns.cloudflare.com, carioca.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for h3co.com (unsigned zone)

⏱️ Timing

Total: 234ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.170.3, 104.21.54.253`
AAAA	2	`2606:4700:3030::ac43:aa03, 2606:4700:3031::6815:36fd`
NS	2	`carioca.ns.cloudflare.com, frank.ns.cloudflare.com`
MX	2	`usb-smtp-inbound-1.mimecast.com (pri: 10, usb-smtp-inbound-2.mimecast.com (pri: 10`
TXT	5	`0ed1fe018a39dade9e833a4cf4b92f6f, MS=ms44812597...`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`carioca.ns.cloudflare.com dns.cloudflare`

📌 Glue Records Collected

Total: 12

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

Analysis

IP Addresses

h3co.com has four IP addresses: 104.21.54.253, 172.67.170.3, 2606:4700:3030::ac43:aa03 and 2606:4700:3031::6815:36fd.

Among the host names that share IP numbers with h3co.com are wordpress-sucks.com, houseaddicts.com, www.ykmsm.com and two others.

Name Servers

h3co.com is served by two delegated name servers, carioca.ns.cloudflare.com and frank.ns.cloudflare.com.

h3co.com has the same name server delegation as a number of other domains, such as fuzby.org, displetech.com, kidobebe.com and two more.

h3co.com has at least partial name server overlap with other domains, such as yourinfinidateventssource.com, pizzeriamezzogiorno.com, avenuenailsandspa.com and two others.

It is common to find these name servers paired with the name servers joel.ns.cloudflare.com.

Host names resolving to 6 IP numbers:

carioca.ns.cloudflare.com carries IP addresses 108.162.194.20, 162.159.38.20 and 172.64.34.20, with 3 other addresses beyond those.

frank.ns.cloudflare.com carries IP addresses 108.162.193.166, 172.64.33.166 and 173.245.59.166, with 3 other addresses beyond those.

Mail Servers

The MX records for h3co.com point to two mail servers: usb-smtp-inbound-1.mimecast.com and usb-smtp-inbound-2.mimecast.com.

h3co.com has the same mail server arrangement as a number of other domains, for example gumc.georgetown.edu, usa811.org, dinosaursofthefuture.com and two more.

h3co.com shares at least some of its mail servers with other domains — for example axxair.com, lauramac.com, cstx.gov and two more.

The host names usb-smtp-inbound-1.mimecast.com and usb-smtp-inbound-2.mimecast.com both direct to 170.10.150.242 and 170.10.152.242.

These two host names — usb-smtp-inbound-1.mimecast.com and usb-smtp-inbound-2.mimecast.com — each point to 170.10.150.242 IP addresses.

These two host names — usb-smtp-inbound-1.mimecast.com and usb-smtp-inbound-2.mimecast.com — each point to 170.10.152.242 IP addresses.

h3co.com - robtex.com

h3co.com

com

Same first word

Similar names

DNS History

🔍 DNS Trace

📋 Delegation Chain

✅ Authoritative Response

🔒 DNSSEC Status

⏱️ Timing

📄 Records

📌 Glue Records Collected

Analysis

IP Addresses

Name Servers

Mail Servers

`h3co.com`

`com`