testcloud.io - dns.ninja
testcloud.io
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| A | 2606:4700:3031::ac43:86e4🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 2606:4700:3035::6815:19ec🇺🇸 Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 104.21.25.236Cloudflare104.21.16.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 172.67.134.228🇺🇸 Cloudflare172.67.128.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| NS | ruth.ns.cloudflare.com ⭐ | ||||||
| A | 2606:4700:50::adf5:3a8f🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | ruth.ns.cloudflare.com | ||||||
| A | 2803:f800:50::6ca2:c08f🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L | ||||||
| PTR | ruth.ns.cloudflare.com | ||||||
| A | 2a06:98c1:50::ac40:208f🇺🇸 Cloudflare2a06:98c1:50::/45 | ||||||
| PTR | ruth.ns.cloudflare.com | ||||||
| A | 108.162.192.143🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | ruth.ns.cloudflare.com | ||||||
| A | 172.64.32.143🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | ruth.ns.cloudflare.com | ||||||
| A | 173.245.58.143🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | ruth.ns.cloudflare.com | ||||||
| NS | sri.ns.cloudflare.com | ||||||
| A | 2606:4700:58::adf5:3bea🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | sri.ns.cloudflare.com | ||||||
| A | 2803:f800:50::6ca2:c1ea🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L | ||||||
| PTR | sri.ns.cloudflare.com | ||||||
| A | 2a06:98c1:50::ac40:21ea🇺🇸 Cloudflare2a06:98c1:50::/45 | ||||||
| PTR | sri.ns.cloudflare.com | ||||||
| A | 108.162.193.234🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | sri.ns.cloudflare.com | ||||||
| A | 172.64.33.234🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | sri.ns.cloudflare.com | ||||||
| A | 173.245.59.234🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | sri.ns.cloudflare.com | ||||||
| MX | route3.mx.cloudflare.net ⭐ | ||||||
| A | 2606:4700:f5::11🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | route3.mx.cloudflare.net | ||||||
| A | 2606:4700:f5::12🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | route3.mx.cloudflare.net | ||||||
| A | 2606:4700:f5::13🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | route3.mx.cloudflare.net | ||||||
| A | 162.159.205.23Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | route3.mx.cloudflare.net | ||||||
| A | 162.159.205.24Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | route3.mx.cloudflare.net | ||||||
| A | 162.159.205.25Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | route3.mx.cloudflare.net | ||||||
| MX | route2.mx.cloudflare.net(36) | ||||||
| A | 2606:4700:f5::e🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | route2.mx.cloudflare.net | ||||||
| A | 2606:4700:f5::f🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | route2.mx.cloudflare.net | ||||||
| A | 2606:4700:f5::10🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | route2.mx.cloudflare.net | ||||||
| A | 162.159.205.17Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | route2.mx.cloudflare.net | ||||||
| A | 162.159.205.18Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | route2.mx.cloudflare.net | ||||||
| A | 162.159.205.19Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | route2.mx.cloudflare.net | ||||||
| MX | route1.mx.cloudflare.net(79) | ||||||
| A | 2606:4700:f5::b🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | route1.mx.cloudflare.net | ||||||
| A | 2606:4700:f5::c🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | route1.mx.cloudflare.net | ||||||
| A | 2606:4700:f5::d🇺🇸 Cloudflare2606:4700:f5::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | route1.mx.cloudflare.net | ||||||
| A | 162.159.205.11Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | route1.mx.cloudflare.net | ||||||
| A | 162.159.205.12Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | route1.mx.cloudflare.net | ||||||
| A | 162.159.205.13Cloudflare162.159.205.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | route1.mx.cloudflare.net | ||||||
| TXT | apple-domain-verification=YdqsJXi4k3IGOFSd | ||||||
| TXT | google-site-verification=cjgnX1ZGDOJ3DZDyc8aT53P1RktOIh-3tm5piLgbOJw | ||||||
| TXT | v=spf1 include:_spf.mx.cloudflare.net ~all | ||||||
| HTTPS | HTTP/3, HTTP/2 ✓ hints match | ||||||
| IPv4 hints | 104.21.25.236, 172.67.134.228 | ||||||
| IPv6 hints | 2606:4700:3031::ac43:86e4, 2606:4700:3035::6815:19ec | ||||||
| ECH | X25519, HKDF-SHA256 + AES-128-GCM draft, id=160, name=cloudflare-ech.com | ||||||
| SOA | ruth.ns.cloudflare.comdns@cloudflare.com serial=2408006536 | ||||||
io
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a0.nic.io ⭐ | ||||||
| NS | a2.nic.io | ||||||
| NS | b0.nic.io | ||||||
| NS | c0.nic.io | ||||||
| SOA | a0.nic.iohostmaster@donuts.email serial=1782911112 | ||||||
Subdomains
armor.testcloud.io |
email.testcloud.io |
demo.testcloud.io |
sibel.testcloud.io |
oberyn.testcloud.io |
gustavo.testcloud.io |
intelligence.testcloud.io |
go1.testcloud.io |
Same first word
testcloud.io |
testcloud.net |
testcloud.eu |
testcloud.at |
testcloud.ru |
testcloud.com |
testcloud.win |
testcloud.org |
testcloud.aig |
Similar names
cloudtest.xyz |
ettscloud.com |
cloudtest.fr |
cloudtest.blog |
cloudtest.online |
cloudtest.at |
cloudtest.org |
settcloud.com |
cloudtest.jp |
cloudtest.in |
cloudtest.com |
cloudtest.io |
cloudtest.net |
DNS History
27 records (9 active, 18 former)
○NSjack.ns.cloudflare.com2015-08-18 → 2017-04-07 · 4 obs
● 2015-08-18 16:05:38
● 2017-04-07 03:10:38
○ 2026-02-22 17:18:02
○ 2026-07-01 13:45:50
● 2017-04-07 03:10:38
○ 2026-02-22 17:18:02
○ 2026-07-01 13:45:50
○NSkate.ns.cloudflare.com2015-08-18 → 2017-04-07 · 4 obs
● 2015-08-18 16:05:38
● 2017-04-07 03:10:38
○ 2026-02-22 17:18:02
○ 2026-07-01 13:45:50
● 2017-04-07 03:10:38
○ 2026-02-22 17:18:02
○ 2026-07-01 13:45:50
●NSruth.ns.cloudflare.com2026-02-22 → 2026-07-01 · 3 obs
○ 2017-04-07 03:10:38
● 2026-02-22 17:18:02
● 2026-07-01 13:45:50
● 2026-02-22 17:18:02
● 2026-07-01 13:45:50
●NSsri.ns.cloudflare.com2026-02-22 → 2026-07-01 · 3 obs
○ 2017-04-07 03:10:38
● 2026-02-22 17:18:02
● 2026-07-01 13:45:50
● 2026-02-22 17:18:02
● 2026-07-01 13:45:50
○MXalt1.aspmx.l.google.com2015-08-18 → 2017-04-07 · 4 obs
● 2015-08-18 16:05:38
● 2017-04-07 03:10:38
○ 2026-02-22 17:18:02
○ 2026-07-01 13:45:50
● 2017-04-07 03:10:38
○ 2026-02-22 17:18:02
○ 2026-07-01 13:45:50
○MXalt2.aspmx.l.google.com2015-08-18 → 2017-04-07 · 4 obs
● 2015-08-18 16:05:38
● 2017-04-07 03:10:38
○ 2026-02-22 17:18:02
○ 2026-07-01 13:45:50
● 2017-04-07 03:10:38
○ 2026-02-22 17:18:02
○ 2026-07-01 13:45:50
○MXaspmx.l.google.com2015-08-18 → 2017-04-07 · 4 obs
● 2015-08-18 16:05:38
● 2017-04-07 03:10:38
○ 2026-02-22 17:18:02
○ 2026-07-01 13:45:50
● 2017-04-07 03:10:38
○ 2026-02-22 17:18:02
○ 2026-07-01 13:45:50
○MXaspmx2.googlemail.com2015-08-18 → 2017-04-07 · 4 obs
● 2015-08-18 16:05:38
● 2017-04-07 03:10:38
○ 2026-02-22 17:18:02
○ 2026-07-01 13:45:50
● 2017-04-07 03:10:38
○ 2026-02-22 17:18:02
○ 2026-07-01 13:45:50
○MXaspmx3.googlemail.com2015-08-18 → 2017-04-07 · 4 obs
● 2015-08-18 16:05:38
● 2017-04-07 03:10:38
○ 2026-02-22 17:18:02
○ 2026-07-01 13:45:50
● 2017-04-07 03:10:38
○ 2026-02-22 17:18:02
○ 2026-07-01 13:45:50
●MXroute1.mx.cloudflare.net2026-02-22 → 2026-07-01 · 3 obs
○ 2017-04-07 03:10:38
● 2026-02-22 17:18:02
● 2026-07-01 13:45:50
● 2026-02-22 17:18:02
● 2026-07-01 13:45:50
●MXroute2.mx.cloudflare.net2026-02-22 → 2026-07-01 · 3 obs
○ 2017-04-07 03:10:38
● 2026-02-22 17:18:02
● 2026-07-01 13:45:50
● 2026-02-22 17:18:02
● 2026-07-01 13:45:50
●MXroute3.mx.cloudflare.net2026-02-22 → 2026-07-01 · 3 obs
○ 2017-04-07 03:10:38
● 2026-02-22 17:18:02
● 2026-07-01 13:45:50
● 2026-02-22 17:18:02
● 2026-07-01 13:45:50
●A104.21.25.2362026-02-22 → 2026-07-01 · 11 obs
○ 2017-04-07 03:10:38
● 2026-02-22 17:18:02
● 2026-03-20 02:17:54
○ 2026-03-31 10:32:20
● 2026-04-28 20:14:08
○ 2026-04-30 00:53:06
● 2026-05-20 17:44:50
● 2026-05-24 05:59:04
○ 2026-06-12 20:06:10
● 2026-07-01 05:58:44
● 2026-07-01 13:45:50
● 2026-02-22 17:18:02
● 2026-03-20 02:17:54
○ 2026-03-31 10:32:20
● 2026-04-28 20:14:08
○ 2026-04-30 00:53:06
● 2026-05-20 17:44:50
● 2026-05-24 05:59:04
○ 2026-06-12 20:06:10
● 2026-07-01 05:58:44
● 2026-07-01 13:45:50
○A162.159.240.112015-08-18 → 2015-08-18 · 3 obs
● 2015-08-18 16:05:38
○ 2015-12-07 12:35:40
○ 2026-07-01 13:45:50
○ 2015-12-07 12:35:40
○ 2026-07-01 13:45:50
●A172.67.134.2282026-02-22 → 2026-07-01 · 11 obs
○ 2017-04-07 03:10:38
● 2026-02-22 17:18:02
● 2026-03-20 02:17:54
○ 2026-03-31 10:32:20
● 2026-04-28 20:14:08
○ 2026-04-30 00:53:06
● 2026-05-20 17:44:50
● 2026-05-24 05:59:04
○ 2026-06-12 20:06:10
● 2026-07-01 05:58:44
● 2026-07-01 13:45:50
● 2026-02-22 17:18:02
● 2026-03-20 02:17:54
○ 2026-03-31 10:32:20
● 2026-04-28 20:14:08
○ 2026-04-30 00:53:06
● 2026-05-20 17:44:50
● 2026-05-24 05:59:04
○ 2026-06-12 20:06:10
● 2026-07-01 05:58:44
● 2026-07-01 13:45:50
○A188.114.96.02026-03-31 → 2026-06-12 · 9 obs
○ 2026-03-20 02:17:54
● 2026-03-31 10:32:20
○ 2026-04-28 20:14:08
● 2026-04-30 00:53:06
○ 2026-05-20 17:44:50
○ 2026-05-24 05:59:04
● 2026-06-12 20:06:10
○ 2026-07-01 05:58:44
○ 2026-07-01 13:45:50
● 2026-03-31 10:32:20
○ 2026-04-28 20:14:08
● 2026-04-30 00:53:06
○ 2026-05-20 17:44:50
○ 2026-05-24 05:59:04
● 2026-06-12 20:06:10
○ 2026-07-01 05:58:44
○ 2026-07-01 13:45:50
○A188.114.97.02026-03-31 → 2026-06-12 · 9 obs
○ 2026-03-20 02:17:54
● 2026-03-31 10:32:20
○ 2026-04-28 20:14:08
● 2026-04-30 00:53:06
○ 2026-05-20 17:44:50
○ 2026-05-24 05:59:04
● 2026-06-12 20:06:10
○ 2026-07-01 05:58:44
○ 2026-07-01 13:45:50
● 2026-03-31 10:32:20
○ 2026-04-28 20:14:08
● 2026-04-30 00:53:06
○ 2026-05-20 17:44:50
○ 2026-05-24 05:59:04
● 2026-06-12 20:06:10
○ 2026-07-01 05:58:44
○ 2026-07-01 13:45:50
○A198.41.249.102015-08-18 → 2015-08-18 · 3 obs
● 2015-08-18 16:05:38
○ 2015-12-07 12:35:40
○ 2026-07-01 13:45:50
○ 2015-12-07 12:35:40
○ 2026-07-01 13:45:50
○A2400:cb00:2048:1::a29f:f00b2015-08-18 → 2015-08-18 · 3 obs
● 2015-08-18 16:05:38
○ 2015-12-07 12:35:40
○ 2026-07-01 13:45:50
○ 2015-12-07 12:35:40
○ 2026-07-01 13:45:50
○A2400:cb00:2048:1::c629:f90a2015-08-18 → 2015-08-18 · 3 obs
● 2015-08-18 16:05:38
○ 2015-12-07 12:35:40
○ 2026-07-01 13:45:50
○ 2015-12-07 12:35:40
○ 2026-07-01 13:45:50
●A2606:4700:3031::ac43:86e42026-07-01 → 2026-07-01 · 3 obs
○ 2026-06-12 20:06:10
● 2026-07-01 05:58:44
● 2026-07-01 13:45:50
● 2026-07-01 05:58:44
● 2026-07-01 13:45:50
●A2606:4700:3035::6815:19ec2026-07-01 → 2026-07-01 · 3 obs
○ 2026-06-12 20:06:10
● 2026-07-01 05:58:44
● 2026-07-01 13:45:50
● 2026-07-01 05:58:44
● 2026-07-01 13:45:50
○A2606:4700:3035::ac43:86e42026-02-22 → 2026-05-24 · 10 obs
○ 2017-04-07 03:10:38
● 2026-02-22 17:18:02
● 2026-03-20 02:17:54
○ 2026-03-31 10:32:20
● 2026-04-28 20:14:08
○ 2026-04-30 00:53:06
● 2026-05-20 17:44:50
● 2026-05-24 05:59:04
○ 2026-06-12 20:06:10
○ 2026-07-01 13:45:50
● 2026-02-22 17:18:02
● 2026-03-20 02:17:54
○ 2026-03-31 10:32:20
● 2026-04-28 20:14:08
○ 2026-04-30 00:53:06
● 2026-05-20 17:44:50
● 2026-05-24 05:59:04
○ 2026-06-12 20:06:10
○ 2026-07-01 13:45:50
○A2606:4700:3036::6815:19ec2026-02-22 → 2026-05-24 · 10 obs
○ 2017-04-07 03:10:38
● 2026-02-22 17:18:02
● 2026-03-20 02:17:54
○ 2026-03-31 10:32:20
● 2026-04-28 20:14:08
○ 2026-04-30 00:53:06
● 2026-05-20 17:44:50
● 2026-05-24 05:59:04
○ 2026-06-12 20:06:10
○ 2026-07-01 13:45:50
● 2026-02-22 17:18:02
● 2026-03-20 02:17:54
○ 2026-03-31 10:32:20
● 2026-04-28 20:14:08
○ 2026-04-30 00:53:06
● 2026-05-20 17:44:50
● 2026-05-24 05:59:04
○ 2026-06-12 20:06:10
○ 2026-07-01 13:45:50
○A2a06:98c1:3120::2026-03-31 → 2026-06-12 · 9 obs
○ 2026-03-20 02:17:54
● 2026-03-31 10:32:20
○ 2026-04-28 20:14:08
● 2026-04-30 00:53:06
○ 2026-05-20 17:44:50
○ 2026-05-24 05:59:04
● 2026-06-12 20:06:10
○ 2026-07-01 05:58:44
○ 2026-07-01 13:45:50
● 2026-03-31 10:32:20
○ 2026-04-28 20:14:08
● 2026-04-30 00:53:06
○ 2026-05-20 17:44:50
○ 2026-05-24 05:59:04
● 2026-06-12 20:06:10
○ 2026-07-01 05:58:44
○ 2026-07-01 13:45:50
○A2a06:98c1:3121::2026-03-31 → 2026-06-12 · 9 obs
○ 2026-03-20 02:17:54
● 2026-03-31 10:32:20
○ 2026-04-28 20:14:08
● 2026-04-30 00:53:06
○ 2026-05-20 17:44:50
○ 2026-05-24 05:59:04
● 2026-06-12 20:06:10
○ 2026-07-01 05:58:44
○ 2026-07-01 13:45:50
● 2026-03-31 10:32:20
○ 2026-04-28 20:14:08
● 2026-04-30 00:53:06
○ 2026-05-20 17:44:50
○ 2026-05-24 05:59:04
● 2026-06-12 20:06:10
○ 2026-07-01 05:58:44
○ 2026-07-01 13:45:50
○A88.198.68.712015-12-07 → 2017-04-07 · 5 obs
○ 2015-08-18 16:05:38
● 2015-12-07 12:35:40
● 2017-04-07 03:10:38
○ 2026-02-22 17:18:02
○ 2026-07-01 13:45:50
● 2015-12-07 12:35:40
● 2017-04-07 03:10:38
○ 2026-02-22 17:18:02
○ 2026-07-01 13:45:50
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| io | a0.nic.io, a2.nic.io, b0.nic.io, c0.nic.io | - |
| testcloud.io | sri.ns.cloudflare.com, ruth.ns.cloudflare.com | - |
✅ Authoritative Response
Server:173.245.59.234
NS records: sri.ns.cloudflare.com, ruth.ns.cloudflare.com
🔒 DNSSEC Status
🔐 Secure (DNSSEC validated)
Chain of trust verified from root to domain
⏱️ Timing
Total: 931ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 2 | 172.67.134.228, 104.21.25.236 |
| AAAA | 2 | 2606:4700:3035::6815:19ec, 2606:4700:3031::ac43:86e4 |
| NS | 2 | ruth.ns.cloudflare.com, sri.ns.cloudflare.com |
| MX | 3 | route3.mx.cloudflare.net (pri: 15), route2.mx.cloudflare.net (pri: 36)... |
| TXT | 3 | apple-domain-verification=YdqsJXi4k3IGOF, google-site-verification=cjgnX1ZGDOJ3DZD... |
| HTTPS | 1 | {"priority":1,"target":".","alpn":["h3", |
| SOA | 1 | ruth.ns.cloudflare.com dns.cloudflare.co |
Analysis
Hierarchy
armor.testcloud.io, email.testcloud.io, demo.testcloud.io, sibel.testcloud.io, oberyn.testcloud.io and a few other host names are all children of testcloud.io.
IP Addresses
testcloud.io points to the four IP addresses 104.21.25.236, 172.67.134.228, 2606:4700:3031::ac43:86e4 and 2606:4700:3035::6815:19ec.
shinhollywood.com, static.spektrnews.in.ua, illimitado.com plus two other host names have IP numbers in common with testcloud.io.
Name Servers
Two name servers handle the delegation for testcloud.io: ruth.ns.cloudflare.com and sri.ns.cloudflare.com.
The name server configuration of testcloud.io is shared with other domains, for instance maharsh.net, continuous-testing.de, teamcipher.com and two others.
The name servers of testcloud.io overlap at least partially with those of other domains — among them confirmbets.com, metcredit.com, arsnoy.party and two more.
These name servers commonly appear in combination with the name servers paige.ns.cloudflare.com.
Hosts with 6 IP addresses each:
ruth.ns.cloudflare.com resolves to 108.162.192.143, 172.64.32.143 and 173.245.58.143 among others, with 3 other IP addresses in total.
sri.ns.cloudflare.com resolves to 108.162.193.234, 172.64.33.234 and 173.245.59.234 among others, with 3 other IP addresses in total.
Mail Servers
Mail for testcloud.io is routed through three mail servers — route1.mx.cloudflare.net, route2.mx.cloudflare.net and route3.mx.cloudflare.net.
At least some of the mail servers used by testcloud.io are shared with other domains: eginitio.gr, berta-mgt.com, albone.net and two others among them.
Hosts with 6 IP addresses each:
route1.mx.cloudflare.net resolves to 162.159.205.11, 162.159.205.12 and 162.159.205.13 among others, with 3 other IP addresses in total.
route2.mx.cloudflare.net resolves to 162.159.205.17, 162.159.205.18 and 162.159.205.19 among others, with 3 other IP addresses in total.
route3.mx.cloudflare.net resolves to 162.159.205.23, 162.159.205.24 and 162.159.205.25 among others, with 3 other IP addresses in total.