firstclassbooks.co - robtex.com
firstclassbooks.co
co
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | ns0.centralnic.net ⭐ | ||||||
| NS | a.registrydns.co | ||||||
| NS | b.registrydns.co | ||||||
| NS | c.registrydns.co | ||||||
| NS | d.registrydns.co | ||||||
| SOA | ns0.centralnic.nethostmaster@centralnic.net serial=1759618578 | ||||||
Same first word
firstclassbooks.com |
firstclassbooks.co |
DNS History
9 records (9 active, 0 former)
●NSns-cloud-c1.googledomains.com2026-03-06 → 2026-03-26 · 2 obs
● 2026-03-26 09:50:56
●NSns-cloud-c2.googledomains.com2026-03-06 → 2026-03-26 · 2 obs
● 2026-03-26 09:50:56
●NSns-cloud-c3.googledomains.com2026-03-06 → 2026-03-26 · 2 obs
● 2026-03-26 09:50:56
●NSns-cloud-c4.googledomains.com2026-03-06 → 2026-03-26 · 2 obs
● 2026-03-26 09:50:56
●MXalt1.aspmx.l.google.com2026-03-06 → 2026-03-26 · 2 obs
● 2026-03-26 09:50:56
●MXalt2.aspmx.l.google.com2026-03-06 → 2026-03-26 · 2 obs
● 2026-03-26 09:50:56
●MXalt3.aspmx.l.google.com2026-03-06 → 2026-03-26 · 2 obs
● 2026-03-26 09:50:56
●MXalt4.aspmx.l.google.com2026-03-06 → 2026-03-26 · 2 obs
● 2026-03-26 09:50:56
●MXaspmx.l.google.com2026-03-06 → 2026-03-26 · 2 obs
● 2026-03-26 09:50:56
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| co | c.registrydns.co, b.registrydns.co, a.registrydns.co, d.registrydns.co | - |
| firstclassbooks.co | ns-cloud-c1.googledomains.com, ns-cloud-c2.googledomains.com, ns-cloud-c3.googledomains.com, ns-cloud-c4.googledomains.com | - |
✅ Authoritative Response
Server:216.239.32.108
NS records: ns-cloud-c1.googledomains.com, ns-cloud-c2.googledomains.com, ns-cloud-c3.googledomains.com, ns-cloud-c4.googledomains.com
🔒 DNSSEC Status
🔐 Secure (DNSSEC validated)
Chain of trust verified from root to domain
⏱️ Timing
Total: 653ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| NS | 4 | ns-cloud-c2.googledomains.com, ns-cloud-c1.googledomains.com... |
| MX | 5 | alt2.aspmx.l.google.com (pri: 5), alt3.aspmx.l.google.com (pri: 10)... |
| TXT | 1 | v=spf1 include:_spf.google.com ~all |
| SOA | 1 | ns-cloud-c1.googledomains.com cloud-dns- |
Analysis
Name Servers
firstclassbooks.co is delegated to four name servers: ns-cloud-c1.googledomains.com, ns-cloud-c2.googledomains.com, ns-cloud-c3.googledomains.com and ns-cloud-c4.googledomains.com.
firstclassbooks.co shares some name servers with other domains, for example nodworthy.com, jajagaga.com, creativepathcoaching.com, queenofcoxwell.com and ahelp.us.
Host names with two IP numbers
Two IPs per host:
ns-cloud-c1.googledomains.com points to 2001:4860:4802:32::6c and 216.239.32.108
ns-cloud-c2.googledomains.com points to 2001:4860:4802:34::6c and 216.239.34.108
ns-cloud-c3.googledomains.com points to 2001:4860:4802:36::6c and 216.239.36.108
ns-cloud-c4.googledomains.com points to 2001:4860:4802:38::6c and 216.239.38.108
Mail Servers
firstclassbooks.co is handled by five mail servers: aspmx.l.google.com, alt1.aspmx.l.google.com, alt2.aspmx.l.google.com, alt3.aspmx.l.google.com and alt4.aspmx.l.google.com.
firstclassbooks.co shares some mail servers with other domains, at least partially; for instance topbox.ca, rudewalrus.com, ungulate.net, ns500742.ns500731.ns500731.ns500731.ns500688.ns500671.ns500678.ns500671.ns500291.ns500666.ns500142.lusty(0x736c7574)z.com and codeacademy.de.
these mail servers are often used together with the mail servers aspmx2.googlemail.com, aspmx3.googlemail.com, aspmx4.googlemail.com and aspmx5.googlemail.com.
Host names with two IPs:
Host aspmx.l.google.com has IPs 2a00:1450:4009:c0f::1a and 192.178.223.26.
Host alt1.aspmx.l.google.com has IPs 2607:f8b0:4023:2801::1a and 192.178.128.26.
Host alt2.aspmx.l.google.com has IPs 2607:f8b0:4023:1015::1a and 172.253.135.27.
Host alt3.aspmx.l.google.com has IPs 2607:f8b0:4023:3003::1a and 172.253.145.26.
Host alt4.aspmx.l.google.com has IPs 2a00:1450:400c:c00::1b and 173.194.76.27.