DNS Record Lookup
Look up DNS records including A, AAAA, MX, NS, SOA, CNAME, TXT, and CAA records for any domain
Hosting & Network
21cs.com runs on Cloudflare, with DNS by AWS Route 53 and email via Microsoft 365.
- Hosting network
- CloudflareAS209242Cloudflare
- Managed DNS
- AWS Route 53
- Microsoft 365
- IPv6 (AAAA)
- Not enabled
- CAA pinning
- None
Sits alongside 314,416 other sites on Cloudflare. Stable here since we started watching (Sep 18, 2026).
DNS Records for 21cs.com
| Hostname | Type | TTL | Priority | Content |
|---|---|---|---|---|
| 21cs.com | NS | 0 | ns-487.awsdns-60.com | |
| 21cs.com | NS | 0 | ns-1645.awsdns-13.co.uk | |
| 21cs.com | NS | 0 | ns-589.awsdns-09.net | |
| 21cs.com | NS | 0 | ns-1124.awsdns-12.org | |
| 21cs.com | SOA | 86400 | ns-487.awsdns-60.com awsdns-hostmaster.amazon.com 1 7200 900 1209600 86400 | |
| 21cs.com | MX | 0 | 21cs-com.mail.protection.outlook.com | |
| 21cs.com | A | 0 | 199.60.103.149 | |
| 21cs.com | A | 0 | 199.60.103.49 | |
| 21cs.com | TXT | 0 | anthropic-domain-verification-prcnwk=0znkqfZI0qv2ToANA0V19p5td | |
| 21cs.com | TXT | 0 | v=spf1 ip4:164.90.172.12 include:spf.protection.outlook.com include:smtp.ultipro.com include:mail03-out.ultimatesoftware.com include:22678977.spf10.hubspotemail.net include:spf1.21cs.com -all | |
| 21cs.com | TXT | 0 | atlassian-domain-verification=xMSlwRaB5wpkzytV8nDjeCA6ksPrzY7XWVEPOuPH0TeMpaizEaLqExfvOmbWfPmd | |
| 21cs.com | TXT | 0 | b8dvnwn7q6cp2tzxkjvly5wy14jmn34m | |
| 21cs.com | TXT | 0 | perplexity-ai-domain-verification-y2hsr0=Mf2JTdgicz4W3aaLTlqShNCiS | |
| www.21cs.com | CNAME | 0 | 49373648.group48.sites.hubspot.net | |
| www.21cs.com | A | 0 | 199.60.103.28 | |
| www.21cs.com | A | 0 | 199.60.103.228 | |
| www.21cs.com | AAAA | 0 | 2606:2c40::c73c:67e4 | |
| www.21cs.com | AAAA | 0 | 2606:2c40::c73c:671c |
Get alerted the moment 21cs.com's DNS changes
This page is today's snapshot. Turn on monitoring and we'll watch 21cs.com continuously, notifying you the moment anything moves across all three signals:
Uptime
We visit the site from multiple regions worldwide and email you within minutes if it goes down, with a per-region breakdown so a real outage stands out from a regional blip.
DNS changes
We watch NS, MX, CAA, CNAME, TXT and A/AAAA records, and identify the host, network, and ASN behind them, so a real migration or hijack stands out from routine noise.
TLS certificate
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About DNS Records
DNS (Domain Name System) records are instructions that provide information about a domain, including its IP addresses, mail servers, and other services. Common record types include:
- SOA (Start of Authority) - Contains administrative information about the zone
- NS (Nameserver) - Specifies authoritative nameservers for the domain
- A (Address) - Maps a domain to an IPv4 address
- AAAA - Maps a domain to an IPv6 address
- CNAME (Canonical Name) - Creates an alias pointing to another domain
- MX (Mail Exchange) - Specifies mail servers for the domain