`optimalercheckout.at`

DNSSEC	⚠️ Not signed
A	52.31.3.145^{🇮🇪 Amazon52.30.0.0/15 EC2 DUB prefix}
		PTR	`ec2-52-31-3-145.eu-west-1.compute.amazonaws.com`
A	54.78.220.134^{🇮🇪 Amazon54.78.0.0/16 EC2 DUB prefix}
A	54.194.90.6^{🇮🇪 Amazon54.194.0.0/16 VPC DUB 54.194.0.0/16}
NS	`ns-376.awsdns-47.com` ⭐
		A	2600:9000:5301:7800::1^{🇺🇸 Amazon2600:9000:5301::/48 - CloudFront}
			PTR	`ns-376.awsdns-47.com`
		A	205.251.193.120^{🇺🇸 Amazon205.251.193.0/24 prefix}
			PTR	`ns-376.awsdns-47.com`
NS	`ns-1516.awsdns-61.org`
		A	2600:9000:5305:ec00::1^{🇺🇸 Amazon2600:9000:5305::/48 - CloudFront}
			PTR	`ns-1516.awsdns-61.org`
		A	205.251.197.236^{🇺🇸 Amazon205.251.197.0/24 prefix}
			PTR	`ns-1516.awsdns-61.org`
NS	`ns-1560.awsdns-03.co.uk`
		A	2600:9000:5306:1800::1^{🇺🇸 Amazon2600:9000:5306::/48 - CloudFront}
			PTR	`ns-1560.awsdns-03.co.uk`
		A	205.251.198.24^{🇺🇸 Amazon205.251.198.0/24 prefix}
			PTR	`ns-1560.awsdns-03.co.uk`
NS	`ns-731.awsdns-27.net`
		A	2600:9000:5302:db00::1^{🇺🇸 Amazon2600:9000:5302::/48 - CloudFront}
			PTR	`ns-731.awsdns-27.net`
		A	205.251.194.219^{🇺🇸 Amazon205.251.194.0/24 prefix}
			PTR	`ns-731.awsdns-27.net`
MX	`mxz1.klarna.com` ⭐
		A	52.30.236.203^{🇮🇪 Amazon52.30.0.0/15 EC2 DUB prefix}
			PTR	`ec2-52-30-236-203.eu-west-1.compute.amazonaws.com`
MX	`mxz2.klarna.com` ⭐
		A	54.73.174.245^{🇮🇪 Amazon54.73.0.0/16 EC2 DUB prefix}
			PTR	`ec2-54-73-174-245.eu-west-1.compute.amazonaws.com`
MX	`mxz3.klarna.com` ⭐
		A	3.73.181.240^{🇩🇪 Amazon3.64.0.0/12 EC2 FRA Prefix}
			PTR	`ec2-3-73-181-240.eu-central-1.compute.amazonaws.com`
MX	`mxz4.klarna.com`⁽²⁰⁾
		A	35.156.176.213^{🇩🇪 Amazon35.156.0.0/14 EC2 FRA prefix}
			PTR	`ec2-35-156-176-213.eu-central-1.compute.amazonaws.com`
MX	`mxz5.klarna.com`⁽²⁰⁾
MX	`mxz6.klarna.com`⁽²⁰⁾
TXT	`v=spf1 include:klarna.com -all`
SOA	`ns-376.awsdns-47.com`awsdns-hostmaster@amazon.com serial=1

`at`

	DNSSEC	🔒 Signed (DS record present)
	NS	`dns.nic.at` ⭐
	NS	`d.ns.at`
	NS	`j.ns.at`
	NS	`n.ns.at`
	NS	`ns1.univie.ac.at`
	NS	`ns2.univie.ac.at`
	NS	`r.ns.at`
	NS	`u.ns.at`
	SOA	`dns.nic.at`domain-admin@univie.ac.at serial=1777150802

Same first word

optimalercheckout.at

optimalercheckout.de

DNS History

30 records (13 active, 17 former)

○NSdns1.cscdns.net2020-03-27 → 2020-03-27 · 4 obs

○ 2016-06-19 22:14:26
● 2020-03-27 18:27:48
○ 2026-03-17 12:00:20
○ 2026-04-25 21:21:36

○NSdns2.cscdns.net2020-03-27 → 2020-03-27 · 4 obs

○ 2016-06-19 22:14:26
● 2020-03-27 18:27:48
○ 2026-03-17 12:00:20
○ 2026-04-25 21:21:36

●NSns-1516.awsdns-61.org2026-03-17 → 2026-04-25 · 3 obs

○ 2020-03-27 18:27:48
● 2026-03-17 12:00:20
● 2026-04-25 21:21:36

●NSns-1560.awsdns-03.co.uk2026-03-17 → 2026-04-25 · 3 obs

○ 2020-03-27 18:27:48
● 2026-03-17 12:00:20
● 2026-04-25 21:21:36

●NSns-376.awsdns-47.com2026-03-17 → 2026-04-25 · 3 obs

○ 2020-03-27 18:27:48
● 2026-03-17 12:00:20
● 2026-04-25 21:21:36

●NSns-731.awsdns-27.net2026-03-17 → 2026-04-25 · 3 obs

○ 2020-03-27 18:27:48
● 2026-03-17 12:00:20
● 2026-04-25 21:21:36

○NSns1.nameisp.info2015-07-10 → 2016-06-19 · 4 obs

● 2015-07-10 03:55:02
● 2016-06-19 22:14:26
○ 2020-03-27 18:27:48
○ 2026-04-25 21:21:36

○NSns2.nameisp.info2015-07-10 → 2016-06-19 · 4 obs

● 2015-07-10 03:55:02
● 2016-06-19 22:14:26
○ 2020-03-27 18:27:48
○ 2026-04-25 21:21:36

○MXcustmx.cscdns.net2020-03-27 → 2020-03-27 · 3 obs

● 2020-03-27 18:27:48
○ 2026-03-17 12:00:20
○ 2026-04-25 21:21:36

●MXmxz1.klarna.com2026-03-17 → 2026-04-25 · 3 obs

○ 2020-03-27 18:27:48
● 2026-03-17 12:00:20
● 2026-04-25 21:21:36

●MXmxz2.klarna.com2026-03-17 → 2026-04-25 · 3 obs

○ 2020-03-27 18:27:48
● 2026-03-17 12:00:20
● 2026-04-25 21:21:36

●MXmxz3.klarna.com2026-03-17 → 2026-04-25 · 3 obs

○ 2020-03-27 18:27:48
● 2026-03-17 12:00:20
● 2026-04-25 21:21:36

●MXmxz4.klarna.com2026-03-17 → 2026-04-25 · 3 obs

○ 2020-03-27 18:27:48
● 2026-03-17 12:00:20
● 2026-04-25 21:21:36

●MXmxz5.klarna.com2026-03-17 → 2026-04-25 · 3 obs

○ 2020-03-27 18:27:48
● 2026-03-17 12:00:20
● 2026-04-25 21:21:36

●MXmxz6.klarna.com2026-03-17 → 2026-04-25 · 3 obs

○ 2020-03-27 18:27:48
● 2026-03-17 12:00:20
● 2026-04-25 21:21:36

○A108.128.192.132026-04-24 → 2026-04-24 · 4 obs

○ 2026-04-05 02:10:24
● 2026-04-24 02:08:50
● 2026-04-24 05:45:10
○ 2026-04-25 21:21:36

○A165.160.13.202020-03-27 → 2020-03-27 · 4 obs

○ 2016-06-19 22:14:26
● 2020-03-27 18:27:48
○ 2026-03-17 12:00:20
○ 2026-04-25 21:21:36

○A165.160.15.202020-03-27 → 2020-03-27 · 4 obs

○ 2016-06-19 22:14:26
● 2020-03-27 18:27:48
○ 2026-03-17 12:00:20
○ 2026-04-25 21:21:36

○A18.200.64.1212026-03-17 → 2026-03-17 · 4 obs

○ 2020-03-27 18:27:48
● 2026-03-17 12:00:20
○ 2026-04-05 02:10:24
○ 2026-04-25 21:21:36

○A46.137.76.262026-03-17 → 2026-03-17 · 4 obs

○ 2020-03-27 18:27:48
● 2026-03-17 12:00:20
○ 2026-04-05 02:10:24
○ 2026-04-25 21:21:36

○A46.59.32.2112016-02-13 → 2016-02-13 · 4 obs

○ 2015-11-10 00:53:16
● 2016-02-13 00:37:42
○ 2016-06-19 22:14:26
○ 2026-04-25 21:21:36

○A52.208.218.1442026-04-05 → 2026-04-05 · 4 obs

○ 2026-03-17 12:00:20
● 2026-04-05 02:10:24
○ 2026-04-24 02:08:50
○ 2026-04-25 21:21:36

○A52.211.169.432026-04-05 → 2026-04-05 · 4 obs

○ 2026-03-17 12:00:20
● 2026-04-05 02:10:24
○ 2026-04-24 02:08:50
○ 2026-04-25 21:21:36

●A52.31.3.1452026-04-25 → 2026-04-25 · 2 obs

○ 2026-04-24 05:45:10
● 2026-04-25 21:21:36

●A54.194.90.62026-04-24 → 2026-04-25 · 3 obs

○ 2026-04-05 02:10:24
● 2026-04-24 02:08:50
● 2026-04-25 21:21:36

○A54.217.137.1412026-04-05 → 2026-04-05 · 4 obs

○ 2026-03-17 12:00:20
● 2026-04-05 02:10:24
○ 2026-04-24 02:08:50
○ 2026-04-25 21:21:36

●A54.78.220.1342026-04-24 → 2026-04-25 · 3 obs

○ 2026-04-05 02:10:24
● 2026-04-24 02:08:50
● 2026-04-25 21:21:36

○A63.35.59.392026-03-17 → 2026-03-17 · 4 obs

○ 2020-03-27 18:27:48
● 2026-03-17 12:00:20
○ 2026-04-05 02:10:24
○ 2026-04-25 21:21:36

○A81.93.143.2132015-07-10 → 2015-11-10 · 4 obs

● 2015-07-10 03:55:02
● 2015-11-10 00:53:16
○ 2016-02-13 00:37:42
○ 2026-04-25 21:21:36

○A95.209.129.1242016-06-19 → 2016-06-19 · 4 obs

○ 2016-02-13 00:37:42
● 2016-06-19 22:14:26
○ 2020-03-27 18:27:48
○ 2026-04-25 21:21:36

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
at	u.ns.at, ns2.univie.ac.at, n.ns.at, d.ns.at...	-
optimalercheckout.at	ns-376.awsdns-47.com, ns-731.awsdns-27.net, ns-1516.awsdns-61.org, ns-1560.awsdns-03.co.uk	-

✅ Authoritative Response

Server:205.251.198.24

NS records: ns-376.awsdns-47.com, ns-731.awsdns-27.net, ns-1516.awsdns-61.org, ns-1560.awsdns-03.co.uk

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for optimalercheckout.at (unsigned zone)

⏱️ Timing

Total: 930ms | Queries: -

📄 Records

Type	Count	Sample Data
A	3	`54.194.90.6, 52.31.3.145...`
NS	4	`ns-1516.awsdns-61.org, ns-1560.awsdns-03.co.uk...`
MX	6	`mxz1.klarna.com (pri: 10), mxz2.klarna.com (pri: 10)...`
TXT	1	`v=spf1 include:klarna.com -all`
SOA	1	`ns-376.awsdns-47.com awsdns-hostmaster.a`

Analysis

IP Addresses

Three IP numbers (52.31.3.145, 54.78.220.134 and 54.194.90.6) are pointed to by optimalercheckout.at.

other host names for instance klarna-checkout.fi, payinfour.org, klarnasmoooth.com, pink-standard.com and get-klarna.com share IP numbers with optimalercheckout.at.

Name Servers

optimalercheckout.at is delegated to four name servers: ns-376.awsdns-47.com, ns-731.awsdns-27.net, ns-1516.awsdns-61.org and ns-1560.awsdns-03.co.uk.

optimalercheckout.at at least partially shares name servers with other domains, for instance sausageinthebooty.com, idccustomerinsights.com, programmingace.com, brainquakegames-dev.com and securityhome.nl.

These name servers are commonly used with ns-751.awsdns-29.net, ns-1291.awsdns-33.org and ns-1833.awsdns-37.co.uk.

Host names with two IP numbers:

Host name ns-376.awsdns-47.com points to: 2600:9000:5301:7800::1 and 205.251.193.120.

Host name ns-731.awsdns-27.net points to: 2600:9000:5302:db00::1 and 205.251.194.219.

Host name ns-1516.awsdns-61.org points to: 2600:9000:5305:ec00::1 and 205.251.197.236.

Host name ns-1560.awsdns-03.co.uk points to: 2600:9000:5306:1800::1 and 205.251.198.24.

Mail Servers

optimalercheckout.at is handled by six mail servers: mxz1.klarna.com, mxz2.klarna.com, mxz3.klarna.com, mxz4.klarna.com, mxz5.klarna.com and mxz6.klarna.com.

optimalercheckout.at shares mail servers with other domains at least partially, including smooothshopping.com, billpay.ch, klarna.co.at, sofortbank.us and segoria.dk.

Host names with one IP number:

mxz1.klarna.com points to 52.30.236.203

mxz2.klarna.com points to 54.73.174.245

mxz3.klarna.com points to 3.73.181.240

mxz4.klarna.com points to 35.156.176.213

optimalercheckout.at - robtex.com