21core.com - dns.ninja

21core.com

DNSSEC⚠️ Not signed
A192.0.78.12🇺🇸 Automattic192.0.78.0/24 Route Object
A192.0.78.13🇺🇸 Automattic192.0.78.0/24 Route Object
NSns-1278.awsdns-31.org ⭐
A2600:9000:5304:fe00::1🇺🇸 Amazon2600:9000:5304::/48 - CloudFront
PTRns-1278.awsdns-31.org
A205.251.196.254🇺🇸 Amazon205.251.196.0/24 prefix
PTRns-1278.awsdns-31.org
NSns-1926.awsdns-48.co.uk
A2600:9000:5307:8600::1🇺🇸 Amazon2600:9000:5307::/48 - CloudFront
PTRns-1926.awsdns-48.co.uk
A205.251.199.134🇺🇸 Amazon205.251.199.0/24 prefix
PTRns-1926.awsdns-48.co.uk
NSns-310.awsdns-38.com
A2600:9000:5301:3600::1🇺🇸 Amazon2600:9000:5301::/48 - CloudFront
PTRns-310.awsdns-38.com
A205.251.193.54🇺🇸 Amazon205.251.193.0/24 prefix
PTRns-310.awsdns-38.com
NSns-577.awsdns-08.net
A2600:9000:5302:4100::1🇺🇸 Amazon2600:9000:5302::/48 - CloudFront
PTRns-577.awsdns-08.net
A205.251.194.65🇺🇸 Amazon205.251.194.0/24 prefix
PTRns-577.awsdns-08.net
MX21core-com.mail.protection.outlook.com ⭐
A2a01:111:f403:ca04::b🇮🇪 Microsoft2a01:111:f000::/36
PTRmail-dbbpr03cu00103.inbound.protection.outlook.com
A2a01:111:f403:ca04::c🇮🇪 Microsoft2a01:111:f000::/36
PTRmail-db9pr02cu00204.inbound.protection.outlook.com
A2a01:111:f403:ca09::8🇳🇱 Microsoft2a01:111:f000::/36
PTRmail-as2pr05cu00100.inbound.protection.outlook.com
A2a01:111:f403:ca09::9🇳🇱 Microsoft2a01:111:f000::/36
PTRmail-as8pr04cu00801.inbound.protection.outlook.com
A52.101.68.21🇮🇪 Microsoft52.96.0.0/12 MICROSOFT
PTRmail-db4pr02cu00205.inbound.protection.outlook.com
A52.101.73.1🇳🇱 Microsoft52.96.0.0/12 MICROSOFT
PTRmail-am3pr04cu00501.inbound.protection.outlook.com
A52.101.73.4🇳🇱 Microsoft52.96.0.0/12 MICROSOFT
PTRmail-am0pr83cu00404.inbound.protection.outlook.com
A52.101.73.6🇳🇱 Microsoft52.96.0.0/12 MICROSOFT
PTRmail-am6pr04cu00306.inbound.protection.outlook.com
TXTMS=ms17937886
TXTv=spf1 include:spf.protection.outlook.com -all
SOAns-1278.awsdns-31.orgawsdns-hostmaster@amazon.com serial=1

com

DNSSEC🔒 Signed (DS record present)
NSa.gtld-servers.net ⭐
NSb.gtld-servers.net
NSc.gtld-servers.net
NSd.gtld-servers.net
NSe.gtld-servers.net
NSf.gtld-servers.net
NSg.gtld-servers.net
NSh.gtld-servers.net
NSi.gtld-servers.net
NSj.gtld-servers.net
NSk.gtld-servers.net
NSl.gtld-servers.net
NSm.gtld-servers.net
SOAa.gtld-servers.netnstld@verisign-grs.com serial=1786092789

Subdomains

www.21core.com

Same first word

21core.co.uk
21core.net
21core.com

Similar names

core12.moscow
core21.ca
12core.net
core21.co.kr
core12.org
core12.duckdns.org
cero21.com
12core.com

DNS History

8 records (7 active, 1 former)

20162017201820192020202120222023202420252026NSns-1278.awsdns-31.orgns-1926.awsdns-48.co.ukns-310.awsdns-38.comns-577.awsdns-08.netMX21core-com.mail.protection.outlook.comcore.21core.co.ukA192.0.78.12192.0.78.13
●NSns-1278.awsdns-31.org2015-06-19 → 2026-08-07 · 2 obs
● 2015-06-19 15:53:30
● 2026-08-07 09:04:04
●NSns-1926.awsdns-48.co.uk2015-06-19 → 2026-08-07 · 2 obs
● 2015-06-19 15:53:30
● 2026-08-07 09:04:04
●NSns-310.awsdns-38.com2015-06-19 → 2026-08-07 · 2 obs
● 2015-06-19 15:53:30
● 2026-08-07 09:04:04
●NSns-577.awsdns-08.net2015-06-19 → 2026-08-07 · 2 obs
● 2015-06-19 15:53:30
● 2026-08-07 09:04:04
●MX21core-com.mail.protection.outlook.com2016-12-01 → 2026-08-07 · 5 obs
○ 2016-04-25 23:22:58
● 2016-12-01 11:45:10
● 2017-08-08 15:26:02
○ 2026-07-03 04:07:34
● 2026-08-07 09:04:04
○MXcore.21core.co.uk2015-06-19 → 2016-04-25 · 4 obs
● 2015-06-19 15:53:30
● 2016-04-25 23:22:58
○ 2016-12-01 11:45:10
○ 2026-08-07 09:04:04
●A192.0.78.122015-06-19 → 2026-08-07 · 4 obs
● 2015-06-19 15:53:30
● 2017-08-08 15:26:02
○ 2026-07-03 04:07:34
● 2026-08-07 09:04:04
●A192.0.78.132015-06-19 → 2026-08-07 · 4 obs
● 2015-06-19 15:53:30
● 2017-08-08 15:26:02
○ 2026-07-03 04:07:34
● 2026-08-07 09:04:04

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
comi.gtld-servers.net, k.gtld-servers.net, a.gtld-servers.net, e.gtld-servers.net...-
21core.comns-577.awsdns-08.net, ns-310.awsdns-38.com, ns-1278.awsdns-31.org, ns-1926.awsdns-48.co.uk2 records

✅ Authoritative Response

Server:205.251.199.134

NS records: ns-577.awsdns-08.net, ns-310.awsdns-38.com, ns-1278.awsdns-31.org, ns-1926.awsdns-48.co.uk

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for 21core.com (unsigned zone)

⏱️ Timing

Total: 257ms | Queries: -

📄 Records

TypeCountSample Data
A2192.0.78.13, 192.0.78.12
NS4ns-1278.awsdns-31.org, ns-1926.awsdns-48.co.uk...
MX121core-com.mail.protection.outlook.com (
TXT2MS=ms17937886, v=spf1 include:spf.protection.outlook.co
SOA1ns-1278.awsdns-31.org awsdns-hostmaster.

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns-310.awsdns-38.com, ns-310.awsdns-38.com)

Analysis

Hierarchy

The domain www.21core.com falls under the parent 21core.com.

IP Addresses

21core.com has two IP addresses: 192.0.78.12 and 192.0.78.13

Additional host names — xmlnews.org, lawrevision.state.ny.us, support.intensedebate.com and two others — share IP numbers with 21core.com.

Name Servers

21core.com has four authoritative name servers: ns-310.awsdns-38.com, ns-577.awsdns-08.net, ns-1278.awsdns-31.org and ns-1926.awsdns-48.co.uk.

At least some of 21core.com's name servers are shared with other domains, for example finhay.s3.ap-southeast-1.amazonaws.com, sws.bgslb.fastecn.com, network-firewall.us-east-1.amazonaws.com and two more.

Four hostnames, each resolving to a pair of IP addresses: ns-310.awsdns-38.com directs to 205.251.193.54 and 2600:9000:5301:3600::1; ns-577.awsdns-08.net directs to 205.251.194.65 and 2600:9000:5302:4100::1; ns-1278.awsdns-31.org directs to 205.251.196.254 and 2600:9000:5304:fe00::1; ns-1926.awsdns-48.co.uk directs to 205.251.199.134 and 2600:9000:5307:8600::1.

Mail Servers

21core.com has one mail server: 21core-com.mail.protection.outlook.com.

21core-com.mail.protection.outlook.com points to 8 IP numbers: 52.101.68.21, 52.101.73.1, 52.101.73.4 and 5 other.