`flagstonesoftware.com`

DNSSEC	⚠️ Not signed
A	185.194.90.7^{🇬🇧 KRYSTAL185.194.88.0/22}
		PTR	`trunks-lon.krystal.uk`
NS	`ns1.krystal.uk` ⭐ ⚠️ Not in parent delegation
		A	77.72.0.11^{🇬🇧 KRYSTAL77.72.0.0/21 Krystal Hosting Ltd}
			PTR	`ns1.krystal.uk`
NS	`ns1.krystal.co.uk` ⚠️ Not in zone NS records
		A	77.72.0.11^{🇬🇧 KRYSTAL77.72.0.0/21 Krystal Hosting Ltd}
			PTR	`ns1.krystal.uk`
NS	`ns2.krystal.co.uk` ⚠️ Not in zone NS records
		A	139.162.230.184^{🇬🇧 AKAMAI-LINODE-AP139.162.224.0/19 Akamai Technologies}
			PTR	`ns2.krystal.uk`
NS	`ns2.krystal.uk` ⚠️ Not in parent delegation
		A	139.162.230.184^{🇬🇧 AKAMAI-LINODE-AP139.162.224.0/19 Akamai Technologies}
			PTR	`ns2.krystal.uk`
MX	`mx1.krystal.uk` ⭐
		A	185.53.56.44^{🇬🇧 KRYSTAL185.53.56.0/22}
			PTR	`mx1.strikemail.co.uk`
		A	185.53.56.46^{🇬🇧 KRYSTAL185.53.56.0/22}
			PTR	`mx1.strikemail.co.uk`
MX	`mx2.krystal.uk`⁽²⁰⁾
		A	185.53.56.45^{🇬🇧 KRYSTAL185.53.56.0/22}
			PTR	`mx2.strikemail.co.uk`
		A	185.53.56.47^{🇬🇧 KRYSTAL185.53.56.0/22}
			PTR	`mx2.strikemail.co.uk`
TXT	`v=spf1 +mx +a include:relay.k.io +ip4:77.72.0.66 ~all`
SOA	`ns1.krystal.uk`admin@k-validator-trunks-lon.krystal.uk 2026-04-07 #1

`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=1777084576

WOT: UNKNOWN (60/100)

Previously MX for

www.flagstonesoftware.com

Subdomains

www.flagstonesoftware.com

DNS History

14 records (7 active, 7 former)

○NSns.uk-dns.com2015-08-22 → 2016-04-05 · 4 obs

● 2015-08-22 10:04:04
● 2016-04-05 09:37:24
○ 2016-09-13 10:19:10
○ 2026-04-25 03:05:14

●NSns1.krystal.co.uk2016-09-13 → 2026-04-25 · 3 obs

○ 2016-04-05 09:37:24
● 2016-09-13 10:19:10
● 2026-04-25 03:05:14

●NSns1.krystal.uk2026-04-25 → 2026-04-25 · 3 obs

○ 2016-09-13 10:19:10
● 2026-04-25 03:05:12
● 2026-04-25 03:05:14

●NSns2.krystal.co.uk2016-09-13 → 2026-04-25 · 3 obs

○ 2016-04-05 09:37:24
● 2016-09-13 10:19:10
● 2026-04-25 03:05:14

●NSns2.krystal.uk2026-04-25 → 2026-04-25 · 3 obs

○ 2016-09-13 10:19:10
● 2026-04-25 03:05:12
● 2026-04-25 03:05:14

○NSns2.uk-dns.com2015-08-22 → 2016-04-05 · 4 obs

● 2015-08-22 10:04:04
● 2016-04-05 09:37:24
○ 2016-09-13 10:19:10
○ 2026-04-25 03:05:14

○MXflagstonesoftware.com2015-08-22 → 2016-04-05 · 4 obs

● 2015-08-22 10:04:04
● 2016-04-05 09:37:24
○ 2016-09-13 10:19:10
○ 2026-04-25 03:05:14

○MXmx1.krystal.co.uk2016-09-13 → 2017-06-14 · 5 obs

○ 2016-04-05 09:37:24
● 2016-09-13 10:19:10
● 2017-06-14 01:31:46
○ 2026-04-25 03:05:12
○ 2026-04-25 03:05:14

●MXmx1.krystal.uk2026-04-25 → 2026-04-25 · 3 obs

○ 2017-06-14 01:31:46
● 2026-04-25 03:05:12
● 2026-04-25 03:05:14

○MXmx2.krystal.co.uk2016-09-13 → 2017-06-14 · 5 obs

○ 2016-04-05 09:37:24
● 2016-09-13 10:19:10
● 2017-06-14 01:31:46
○ 2026-04-25 03:05:12
○ 2026-04-25 03:05:14

●MXmx2.krystal.uk2026-04-25 → 2026-04-25 · 3 obs

○ 2017-06-14 01:31:46
● 2026-04-25 03:05:12
● 2026-04-25 03:05:14

●A185.194.90.72026-04-25 → 2026-04-25 · 3 obs

○ 2017-06-14 01:31:46
● 2026-04-25 03:05:12
● 2026-04-25 03:05:14

○A77.72.0.662016-09-13 → 2017-06-14 · 5 obs

○ 2016-04-05 09:37:24
● 2016-09-13 10:19:10
● 2017-06-14 01:31:46
○ 2026-04-25 03:05:12
○ 2026-04-25 03:05:14

○A81.19.187.462015-08-22 → 2016-04-05 · 4 obs

● 2015-08-22 10:04:04
● 2016-04-05 09:37:24
○ 2016-09-13 10:19:10
○ 2026-04-25 03:05:14

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	l.gtld-servers.net, j.gtld-servers.net, h.gtld-servers.net, d.gtld-servers.net...	-
flagstonesoftware.com	ns1.krystal.co.uk, ns2.krystal.co.uk	-

✅ Authoritative Response

Server:77.72.0.11

NS records: ns1.krystal.co.uk, ns2.krystal.co.uk

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for flagstonesoftware.com (unsigned zone)

⏱️ Timing

Total: 717ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`185.194.90.7`
NS	2	`ns1.krystal.uk, ns2.krystal.uk`
MX	2	`mx2.krystal.uk (pri: 20), mx1.krystal.uk (pri: 10)`
TXT	1	`v=spf1 +mx +a include:relay.k.io +ip4:77`
SOA	1	`ns1.krystal.uk admin.k-validator-trunks-`

Analysis

Hierarchy

flagstonesoftware.com is the parent of www.flagstonesoftware.com.

IP Addresses

flagstonesoftware.com points to a single IP number: 185.194.90.7.

other host names for instance ibmt.co.uk, chalfontparkcc.org.uk, ogmios.org, poetrykit.org and kesson.com share IP numbers with flagstonesoftware.com.

Name Servers

flagstonesoftware.com is delegated to four name servers: ns1.krystal.uk, ns2.krystal.uk, ns1.krystal.co.uk and ns2.krystal.co.uk.

flagstonesoftware.com at least partially shares name servers with other domains, for instance 58ragtop.com, numericalreasoning.co.uk, worldalzheimersday.org, shoeuk.co.uk and bengiesystems.co.uk.

these name servers are commonly used with ns1.cloudhosting.uk, ns2.cloudhosting.uk, ns1.uksrv.co.uk, ns2.uksrv.co.uk, ns1.cloudhosting.co.uk and ns2.cloudhosting.co.uk.

Host names with a single IP:

ns1.krystal.uk points to: 77.72.0.11

ns2.krystal.uk points to: 139.162.230.184

ns1.krystal.co.uk points to: 77.72.0.11

ns2.krystal.co.uk points to: 139.162.230.184

Host names pointing to 77.72.0.11: ns1.krystal.uk, ns1.krystal.co.uk

Host names pointing to 139.162.230.184: ns2.krystal.uk, ns2.krystal.co.uk

Mail Servers

flagstonesoftware.com is handled by two mail servers: mx1.krystal.uk and mx2.krystal.uk.

flagstonesoftware.com shares the same mail server setup as other domains, for instance calmera.co.uk, newlocaltools.uk, rufus.technology, evds.info and sleekstone.net.

Host names with two IP numbers:

mx1.krystal.uk points to 185.53.56.44 and 185.53.56.46

mx2.krystal.uk points to 185.53.56.45 and 185.53.56.47

flagstonesoftware.com - robtex.com