DNS Record Lookup
Look up DNS records including A, AAAA, MX, NS, SOA, CNAME, TXT, and CAA records for any domain
Hosting & Network
costto.build runs on Cloudflare, with DNS by Cloudflare and email configured.
- Hosting network
- CloudflareAS13335Cloudflare
- Managed DNS
- Cloudflare
- Configured
- IPv6 (AAAA)
- Enabled
- CAA pinning
- None
Sits alongside 3,982,344 other sites on Cloudflare. Stable here since we started watching (Oct 2, 2026).
The apex and www are the same hosting — the apex via A records.
DNS Records for costto.build
| Hostname | Type | TTL | Priority | Content |
|---|---|---|---|---|
| costto.build | SOA | 1800 | denver.ns.cloudflare.com dns.cloudflare.com 2414944963 10000 2400 604800 1800 | |
| costto.build | MX | 0 | 10 | mx3.feishu.cn |
| costto.build | MX | 0 | 1 | mx1.feishu.cn |
| costto.build | MX | 0 | 5 | mx2.feishu.cn |
| costto.build | AAAA | 0 | 2606:4700:3031::ac43:cfaa | |
| costto.build | AAAA | 0 | 2606:4700:3035::6815:4d79 | |
| costto.build | TXT | 0 | v=spf1 +include:_netblocks.m.feishu.cn -all | |
| costto.build | TXT | 0 | yandex-verification: 0d435008513c97e8 | |
| costto.build | TXT | 0 | google-site-verification=E7XwXQK6gdccFG5g6y8ENE4_EwdCNVOvZ7ZbwrQQHM4 | |
| costto.build | TXT | 0 | verification-code-site-App_feishu=indnZbi3YTkuucwfJHqu | |
| costto.build | NS | 0 | denver.ns.cloudflare.com | |
| costto.build | NS | 0 | liberty.ns.cloudflare.com | |
| costto.build | A | 0 | 104.21.77.121 | |
| costto.build | A | 0 | 172.67.207.170 | |
| www.costto.build | A | 0 | 104.21.77.121 | |
| www.costto.build | A | 0 | 172.67.207.170 | |
| www.costto.build | AAAA | 0 | 2606:4700:3035::6815:4d79 | |
| www.costto.build | AAAA | 0 | 2606:4700:3031::ac43:cfaa |
Get alerted the moment costto.build's DNS changes
This page is today's snapshot. Turn on monitoring and we'll watch costto.build 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, DNSSEC, CNAME 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
We warn you 30, 14, 7, and 1 days before it expires, and flag it if the issuing authority changes or the certificate is unexpectedly replaced.
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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