koelstra.cn - robtex.com

koelstra.cn

DNSSEC⚠️ Not signed
A2606:4700:3033::6815:e90🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3035::ac43:9fae🇺🇸 Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.14.144Cloudflare104.21.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.159.174🇺🇸 Cloudflare172.67.144.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NSlogan.ns.cloudflare.com ⭐
A2606:4700:58::adf5:3bc6🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRlogan.ns.cloudflare.com
A2803:f800:50::6ca2:c1c6🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTRlogan.ns.cloudflare.com
A2a06:98c1:50::ac40:21c6🇺🇸 Cloudflare2a06:98c1:50::/45
PTRlogan.ns.cloudflare.com
A108.162.193.198🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRlogan.ns.cloudflare.com
A172.64.33.198🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRlogan.ns.cloudflare.com
A173.245.59.198🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRlogan.ns.cloudflare.com
NSthea.ns.cloudflare.com
A2606:4700:50::a29f:26f7🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRthea.ns.cloudflare.com
A2803:f800:50::6ca2:c2f7🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTRthea.ns.cloudflare.com
A2a06:98c1:50::ac40:22f7🇺🇸 Cloudflare2a06:98c1:50::/45
PTRthea.ns.cloudflare.com
A108.162.194.247🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRthea.ns.cloudflare.com
A162.159.38.247Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRthea.ns.cloudflare.com
A172.64.34.247🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRthea.ns.cloudflare.com
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.14.144, 172.67.159.174
IPv6 hints2606:4700:3033::6815:e90, 2606:4700:3035::ac43:9fae
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=187, name=cloudflare-ech.com
SOAlogan.ns.cloudflare.comdns@cloudflare.com serial=2410452947

cn

DNSSEC🔒 Signed (DS record present)
NSa.dns.cn ⭐
NSb.dns.cn
NSc.dns.cn
NSd.dns.cn
NSe.dns.cn
NSns.cernet.net ⚠️ Not in parent delegation
SOAa.dns.cnroot@cnnic.cn 2035-10-26 #90

Same first word

koelstra.de
koelstra.dk
koelstra.eu
koelstra.org
koelstra.net
koelstra.fr
koelstra.be
koelstra.blogspot.nl
koelstra.cn
koelstra.com

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DNS History

21 records (6 active, 15 former)

20162017201820192020202120222023202420252026NSlogan.ns.cloudflare.comthea.ns.cloudflare.comns1.init3bv.nlns1.reviced.nlns2.init3bv.nlns2.reviced.nlns3.init3.euns3.reviced.nlns4.init3.euns5.init3.beMXmail.koelstra.cnmx20.koelstra.cnA104.21.14.144172.67.159.1742606:4700:3033::6815:e902606:4700:3035::ac43:9fae2606:4700:3033::ac43:9fae2606:4700:3036::6815:e9037.34.50.13177.81.245.14491.198.106.76
●NSlogan.ns.cloudflare.com2026-06-18 → 2026-07-28 · 3 obs
○ 2020-04-14 22:26:32
● 2026-06-18 03:42:30
● 2026-07-28 20:06:40
○NSns1.init3bv.nl2015-05-08 → 2016-03-20 · 4 obs
● 2015-05-08 16:37:28
● 2016-03-20 16:20:12
○ 2016-07-13 07:54:06
○ 2026-07-28 20:06:40
○NSns1.reviced.nl2016-07-13 → 2020-04-14 · 5 obs
○ 2016-03-20 16:20:12
● 2016-07-13 07:54:06
● 2020-04-14 22:26:32
○ 2026-06-18 03:42:30
○ 2026-07-28 20:06:40
○NSns2.init3bv.nl2015-05-08 → 2016-03-20 · 4 obs
● 2015-05-08 16:37:28
● 2016-03-20 16:20:12
○ 2016-07-13 07:54:06
○ 2026-07-28 20:06:40
○NSns2.reviced.nl2016-07-13 → 2020-04-14 · 5 obs
○ 2016-03-20 16:20:12
● 2016-07-13 07:54:06
● 2020-04-14 22:26:32
○ 2026-06-18 03:42:30
○ 2026-07-28 20:06:40
○NSns3.init3.eu2015-05-08 → 2016-03-20 · 4 obs
● 2015-05-08 16:37:28
● 2016-03-20 16:20:12
○ 2016-07-13 07:54:06
○ 2026-07-28 20:06:40
○NSns3.reviced.nl2016-07-13 → 2020-04-14 · 5 obs
○ 2016-03-20 16:20:12
● 2016-07-13 07:54:06
● 2020-04-14 22:26:32
○ 2026-06-18 03:42:30
○ 2026-07-28 20:06:40
○NSns4.init3.eu2015-05-08 → 2016-03-20 · 4 obs
● 2015-05-08 16:37:28
● 2016-03-20 16:20:12
○ 2016-07-13 07:54:06
○ 2026-07-28 20:06:40
○NSns5.init3.be2015-05-08 → 2016-03-20 · 4 obs
● 2015-05-08 16:37:28
● 2016-03-20 16:20:12
○ 2016-07-13 07:54:06
○ 2026-07-28 20:06:40
●NSthea.ns.cloudflare.com2026-06-18 → 2026-07-28 · 3 obs
○ 2020-04-14 22:26:32
● 2026-06-18 03:42:30
● 2026-07-28 20:06:40
○MXmail.koelstra.cn2016-07-13 → 2020-04-14 · 4 obs
● 2016-07-13 07:54:06
● 2020-04-14 22:26:32
○ 2026-06-18 03:42:30
○ 2026-07-28 20:06:40
○MXmx20.koelstra.cn2016-07-13 → 2020-04-14 · 4 obs
● 2016-07-13 07:54:06
● 2020-04-14 22:26:32
○ 2026-06-18 03:42:30
○ 2026-07-28 20:06:40
●A104.21.14.1442026-06-18 → 2026-07-28 · 3 obs
○ 2020-04-14 22:26:32
● 2026-06-18 03:42:30
● 2026-07-28 20:06:40
●A172.67.159.1742026-06-18 → 2026-07-28 · 3 obs
○ 2020-04-14 22:26:32
● 2026-06-18 03:42:30
● 2026-07-28 20:06:40
●A2606:4700:3033::6815:e902026-07-03 → 2026-07-28 · 3 obs
○ 2026-06-18 03:42:30
● 2026-07-03 03:04:06
● 2026-07-28 20:06:40
○A2606:4700:3033::ac43:9fae2026-06-18 → 2026-06-18 · 4 obs
○ 2020-04-14 22:26:32
● 2026-06-18 03:42:30
○ 2026-07-03 03:04:06
○ 2026-07-28 20:06:40
●A2606:4700:3035::ac43:9fae2026-07-03 → 2026-07-28 · 3 obs
○ 2026-06-18 03:42:30
● 2026-07-03 03:04:06
● 2026-07-28 20:06:40
○A2606:4700:3036::6815:e902026-06-18 → 2026-06-18 · 4 obs
○ 2020-04-14 22:26:32
● 2026-06-18 03:42:30
○ 2026-07-03 03:04:06
○ 2026-07-28 20:06:40
○A37.34.50.1312015-05-08 → 2015-12-16 · 4 obs
● 2015-05-08 16:37:28
● 2015-12-16 21:32:30
○ 2016-03-20 16:20:12
○ 2026-07-28 20:06:40
○A77.81.245.1442016-03-20 → 2016-03-20 · 4 obs
○ 2015-12-16 21:32:30
● 2016-03-20 16:20:12
○ 2016-07-13 07:54:06
○ 2026-07-28 20:06:40
○A91.198.106.762016-07-13 → 2020-04-14 · 5 obs
○ 2016-03-20 16:20:12
● 2016-07-13 07:54:06
● 2020-04-14 22:26:32
○ 2026-06-18 03:42:30
○ 2026-07-28 20:06:40

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
cna.dns.cn, b.dns.cn, c.dns.cn, d.dns.cn...-
koelstra.cnthea.ns.cloudflare.com, logan.ns.cloudflare.com-

✅ Authoritative Response

Server:108.162.194.247

NS records: thea.ns.cloudflare.com, logan.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for koelstra.cn (unsigned zone)

⏱️ Timing

Total: 800ms | Queries: -

📄 Records

TypeCountSample Data
A2104.21.14.144, 172.67.159.174
AAAA22606:4700:3035::ac43:9fae, 2606:4700:3033::6815:e90
NS2logan.ns.cloudflare.com, thea.ns.cloudflare.com
HTTPS1{"priority":1,"target":".","alpn":["h3",
SOA1logan.ns.cloudflare.com dns.cloudflare.c

Analysis

IP Addresses

koelstra.cn has four IP addresses: 104.21.14.144, 172.67.159.174, 2606:4700:3033::6815:e90 and 2606:4700:3035::ac43:9fae.

Two other host names, along with maid.qhmcpro.com, jellystonesiouxfalls.com and shocke.de, also share IP numbers with koelstra.cn.

Name Servers

Two name servers handle the delegation for koelstra.cn: logan.ns.cloudflare.com and thea.ns.cloudflare.com.

koelstra.cn shares its NS records with other domains, for example czyunxun.cn, esyd.cn, u-turn.cn and two others.

koelstra.cn has at least partial name server overlap with other domains, such as 81091.cn, pksofttech.com, usu.za.com and two others.

These name servers tend to appear together with the name servers matias.ns.cloudflare.com, cheryl.ns.cloudflare.com and davina.ns.cloudflare.com.

DNS names with 6 IP addresses:

logan.ns.cloudflare.com resolves to 108.162.193.198, 172.64.33.198 and 173.245.59.198 among others, with 3 other IP addresses in total.

thea.ns.cloudflare.com resolves to 108.162.194.247, 162.159.38.247 and 172.64.34.247 among others, with 3 other IP addresses in total.