🛡️Domain Reputation CheckBlocklist, phishing & malware status→

`osterna.co.uk`

DNSSEC	⚠️ Not signed
A	2606:4700:3031::ac43:a4c8^{🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3034::6815:219f^{🇺🇸 Cloudflare2606:4700:3034::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.33.159^{Cloudflare104.21.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.164.200^{🇺🇸 Cloudflare172.67.160.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`carl.ns.cloudflare.com` ⭐
		A	2606:4700:58::adf5:3b6a^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`carl.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c16a^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`carl.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:216a^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`carl.ns.cloudflare.com`
		A	108.162.193.106^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`carl.ns.cloudflare.com`
		A	172.64.33.106^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`carl.ns.cloudflare.com`
		A	173.245.59.106^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`carl.ns.cloudflare.com`
NS	`emily.ns.cloudflare.com`
		A	2606:4700:50::adf5:3a9b^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`emily.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c09b^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`emily.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:209b^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`emily.ns.cloudflare.com`
		A	108.162.192.155^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`emily.ns.cloudflare.com`
		A	172.64.32.155^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`emily.ns.cloudflare.com`
		A	173.245.58.155^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`emily.ns.cloudflare.com`
MX	`eu-smtp-inbound-1.mimecast.com` ⭐
		A	91.220.42.201^{🇬🇧 MIMECAST-UK91.220.42.0/24 MIMECAST-NET2}
			PTR	`eu-smtp-inbound-1.mimecast.com`
			PTR	`eu-smtp-inbound-2.mimecast.com`
		A	91.220.42.211^{🇬🇧 MIMECAST-UK91.220.42.0/24 MIMECAST-NET2}
			PTR	`eu-smtp-inbound-1.mimecast.com`
			PTR	`eu-smtp-inbound-2.mimecast.com`
		A	91.220.42.241^{🇬🇧 MIMECAST-UK91.220.42.0/24 MIMECAST-NET2}
			PTR	`eu-smtp-inbound-1.mimecast.com`
			PTR	`eu-smtp-inbound-2.mimecast.com`
		A	195.130.217.201^{🇬🇧 MIMECAST-UK195.130.217.0/24}
			PTR	`eu-smtp-inbound-1.mimecast.com`
			PTR	`eu-smtp-inbound-2.mimecast.com`
		A	195.130.217.211^{🇬🇧 MIMECAST-UK195.130.217.0/24}
			PTR	`eu-smtp-inbound-1.mimecast.com`
			PTR	`eu-smtp-inbound-2.mimecast.com`
		A	195.130.217.241^{🇬🇧 MIMECAST-UK195.130.217.0/24}
			PTR	`eu-smtp-inbound-1.mimecast.com`
			PTR	`eu-smtp-inbound-2.mimecast.com`
MX	`eu-smtp-inbound-2.mimecast.com` ⭐
		A	91.220.42.201^{🇬🇧 MIMECAST-UK91.220.42.0/24 MIMECAST-NET2}
			PTR	`eu-smtp-inbound-1.mimecast.com`
			PTR	`eu-smtp-inbound-2.mimecast.com`
		A	91.220.42.211^{🇬🇧 MIMECAST-UK91.220.42.0/24 MIMECAST-NET2}
			PTR	`eu-smtp-inbound-1.mimecast.com`
			PTR	`eu-smtp-inbound-2.mimecast.com`
		A	91.220.42.241^{🇬🇧 MIMECAST-UK91.220.42.0/24 MIMECAST-NET2}
			PTR	`eu-smtp-inbound-1.mimecast.com`
			PTR	`eu-smtp-inbound-2.mimecast.com`
		A	195.130.217.201^{🇬🇧 MIMECAST-UK195.130.217.0/24}
			PTR	`eu-smtp-inbound-1.mimecast.com`
			PTR	`eu-smtp-inbound-2.mimecast.com`
		A	195.130.217.211^{🇬🇧 MIMECAST-UK195.130.217.0/24}
			PTR	`eu-smtp-inbound-1.mimecast.com`
			PTR	`eu-smtp-inbound-2.mimecast.com`
		A	195.130.217.241^{🇬🇧 MIMECAST-UK195.130.217.0/24}
			PTR	`eu-smtp-inbound-1.mimecast.com`
			PTR	`eu-smtp-inbound-2.mimecast.com`
TXT	`0ed1fe018ae8d19ea6ebf74b7a924375a8b77045b0`
TXT	`MS=ms72680980`
TXT	`apple-domain-verification=SeeMCKW98Qv7mDZJ`
TXT	`atlassian-domain-verification=rSNPgXtdK2aBdcq/29r1/kR7hbdDejoi9KeLZZc4nyh3aln...`
TXT	`google-site-verification=VKFCEvk25Aa6Rdgc0fu9hADdpw26HjHOSHaolj27vrI`
TXT	`v=spf1 ip4:192.254.125.237/32 ip4:153.92.242.237/32 ip4:168.245.93.86/32 ip4:...`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.33.159, 172.67.164.200
		IPv6 hints	2606:4700:3031::ac43:a4c8, 2606:4700:3034::6815:219f
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=111, name=cloudflare-ech.com
SOA	`carl.ns.cloudflare.com`dns@cloudflare.com serial=2411318783

`co.uk`

	DNSSEC	⚠️ Not signed
	NS	`dns1.nic.uk` ⭐ ⚠️ Not in parent delegation
	NS	`dns2.nic.uk` ⚠️ Not in parent delegation
	NS	`dns3.nic.uk` ⚠️ Not in parent delegation
	NS	`dns4.nic.uk` ⚠️ Not in parent delegation
	NS	`nsa.nic.uk` ⚠️ Not in parent delegation
	NS	`nsb.nic.uk` ⚠️ Not in parent delegation
	NS	`nsc.nic.uk` ⚠️ Not in parent delegation
	NS	`nsd.nic.uk` ⚠️ Not in parent delegation
	TXT	`#Timestamp: 1786915200`
	SOA	`dns1.nic.uk`hostmaster@nominet.org.uk serial=1786915355

rank #114874 globally
rank #3460 in the tld
WOT: SAFE (74/100)

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DNS History

8 records (8 active, 0 former)

●NScarl.ns.cloudflare.com2026-07-21 → 2026-08-16 · 2 obs

● 2026-07-21 16:21:38
● 2026-08-16 22:14:20

●NSemily.ns.cloudflare.com2026-07-21 → 2026-08-16 · 2 obs

● 2026-07-21 16:21:38
● 2026-08-16 22:14:20

●MXeu-smtp-inbound-1.mimecast.com2026-07-21 → 2026-08-16 · 2 obs

● 2026-07-21 16:21:38
● 2026-08-16 22:14:20

●MXeu-smtp-inbound-2.mimecast.com2026-07-21 → 2026-08-16 · 2 obs

● 2026-07-21 16:21:38
● 2026-08-16 22:14:20

●A104.21.33.1592026-07-21 → 2026-08-16 · 2 obs

● 2026-07-21 16:21:38
● 2026-08-16 22:14:20

●A172.67.164.2002026-07-21 → 2026-08-16 · 2 obs

● 2026-07-21 16:21:38
● 2026-08-16 22:14:20

●A2606:4700:3031::ac43:a4c82026-07-21 → 2026-08-16 · 2 obs

● 2026-07-21 16:21:38
● 2026-08-16 22:14:20

●A2606:4700:3034::6815:219f2026-07-21 → 2026-08-16 · 2 obs

● 2026-07-21 16:21:38
● 2026-08-16 22:14:20

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
uk	dns2.nic.uk, nsa.nic.uk, dns4.nic.uk, dns3.nic.uk...	-
osterna.co.uk	carl.ns.cloudflare.com, emily.ns.cloudflare.com	-

✅ Authoritative Response

Server:108.162.192.155

NS records: carl.ns.cloudflare.com, emily.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for osterna.co.uk (unsigned zone)

⏱️ Timing

Total: 646ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`172.67.164.200, 104.21.33.159`
AAAA	2	`2606:4700:3031::ac43:a4c8, 2606:4700:3034::6815:219f`
NS	2	`carl.ns.cloudflare.com, emily.ns.cloudflare.com`
MX	2	`eu-smtp-inbound-1.mimecast.com (pri: 10), eu-smtp-inbound-2.mimecast.com (pri: 10)`
TXT	6	`0ed1fe018ae8d19ea6ebf74b7a924375a8b77045, MS=ms72680980...`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`carl.ns.cloudflare.com dns.cloudflare.co`

Analysis

IP Addresses

osterna.co.uk resolves to four IP addresses: 104.21.33.159, 172.67.164.200, 2606:4700:3031::ac43:a4c8 and 2606:4700:3034::6815:219f.

Additional host names — sofievalkiers.com, telebid-pro.com, uccui.com and two others — share IP numbers with osterna.co.uk.

Name Servers

Two name servers handle the delegation for osterna.co.uk: carl.ns.cloudflare.com and emily.ns.cloudflare.com.

osterna.co.uk shares its name server setup with other domains, including johnsoncooper.co.uk, venturesgothe.info, cvksa.com and two others.

osterna.co.uk has at least partial name server overlap with other domains, such as amanda-lauren.com, manageverify.com, itstime.pt and two others.

These name servers tend to appear together with the name servers adi.ns.cloudflare.com, teagan.ns.cloudflare.com and mckenzie.ns.cloudflare.com.

Host names with 6 IP numbers:

carl.ns.cloudflare.com resolves to 108.162.193.106, 172.64.33.106 and 173.245.59.106 among others, with 3 other IP addresses in total.

emily.ns.cloudflare.com resolves to 108.162.192.155, 172.64.32.155 and 173.245.58.155 among others, with 3 other IP addresses in total.

Mail Servers

osterna.co.uk has two mail servers: eu-smtp-inbound-1.mimecast.com and eu-smtp-inbound-2.mimecast.com.

osterna.co.uk shares the same mail server setup as other domains, including hsf.com, starlingbank.co.uk, abproduce.co.uk and two others.

osterna.co.uk shares mail servers — at least in part — with other domains, including alif.sa, 5750components.co.uk, cambridgeaudio.es and two others.

Host names with 6 IP numbers:

eu-smtp-inbound-1.mimecast.com resolves to 91.220.42.201, 91.220.42.211 and 91.220.42.241 among others, with 3 other IP addresses in total.

eu-smtp-inbound-2.mimecast.com resolves to 91.220.42.201, 91.220.42.211 and 91.220.42.241 among others, with 3 other IP addresses in total.

eu-smtp-inbound-1.mimecast.com along with eu-smtp-inbound-2.mimecast.com each resolve to 91.220.42.201 IP addresses.

eu-smtp-inbound-1.mimecast.com along with eu-smtp-inbound-2.mimecast.com each resolve to 91.220.42.211 IP addresses.

eu-smtp-inbound-1.mimecast.com along with eu-smtp-inbound-2.mimecast.com each resolve to 91.220.42.241 IP addresses.

eu-smtp-inbound-1.mimecast.com along with eu-smtp-inbound-2.mimecast.com each resolve to 195.130.217.201 IP addresses.

eu-smtp-inbound-1.mimecast.com along with eu-smtp-inbound-2.mimecast.com each resolve to 195.130.217.211 IP addresses.

eu-smtp-inbound-1.mimecast.com along with eu-smtp-inbound-2.mimecast.com each resolve to 195.130.217.241 IP addresses.