mdbook.cc - robtex.com
mdbook.cc
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| A | 2606:4700:3031::ac43:b1c3🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 2606:4700:3037::6815:1f8e🇺🇸 Cloudflare2606:4700:3037::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 104.21.31.142Cloudflare104.21.16.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 172.67.177.195🇺🇸 Cloudflare172.67.176.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| NS | algin.ns.cloudflare.com ⭐ | ||||||
| A | 2606:4700:58::adf5:3b3d🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | algin.ns.cloudflare.com | ||||||
| A | 2803:f800:50::6ca2:c13d🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L | ||||||
| PTR | algin.ns.cloudflare.com | ||||||
| A | 2a06:98c1:50::ac40:213d🇺🇸 Cloudflare2a06:98c1:50::/45 | ||||||
| PTR | algin.ns.cloudflare.com | ||||||
| A | 108.162.193.61🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | algin.ns.cloudflare.com | ||||||
| A | 172.64.33.61🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | algin.ns.cloudflare.com | ||||||
| A | 173.245.59.61🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | algin.ns.cloudflare.com | ||||||
| NS | grace.ns.cloudflare.com | ||||||
| A | 2606:4700:50::adf5:3a9f🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | grace.ns.cloudflare.com | ||||||
| A | 2803:f800:50::6ca2:c09f🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L | ||||||
| PTR | grace.ns.cloudflare.com | ||||||
| A | 2a06:98c1:50::ac40:209f🇺🇸 Cloudflare2a06:98c1:50::/45 | ||||||
| PTR | grace.ns.cloudflare.com | ||||||
| A | 108.162.192.159🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | grace.ns.cloudflare.com | ||||||
| A | 172.64.32.159🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | grace.ns.cloudflare.com | ||||||
| A | 173.245.58.159🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | grace.ns.cloudflare.com | ||||||
| HTTPS | HTTP/3, HTTP/2 ✓ hints match | ||||||
| IPv4 hints | 104.21.31.142, 172.67.177.195 | ||||||
| IPv6 hints | 2606:4700:3031::ac43:b1c3, 2606:4700:3037::6815:1f8e | ||||||
| ECH | X25519, HKDF-SHA256 + AES-128-GCM draft, id=224, name=cloudflare-ech.com | ||||||
| SOA | algin.ns.cloudflare.comdns@cloudflare.com serial=2410387258 | ||||||
cc
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | ac1.nstld.com ⭐ | ||||||
| NS | ac2.nstld.com | ||||||
| NS | ac3.nstld.com | ||||||
| NS | ac4.nstld.com | ||||||
| SOA | ac1.nstld.cominfo@verisign-grs.com serial=1785435597 | ||||||
Same first word
Similar names
DNS History
10 records (6 active, 4 former)
●NSalgin.ns.cloudflare.com2026-07-14 → 2026-07-30 · 2 obs
● 2026-07-30 18:53:48
●NSgrace.ns.cloudflare.com2026-07-14 → 2026-07-30 · 2 obs
● 2026-07-30 18:53:48
●A104.21.31.1422026-07-14 → 2026-07-30 · 3 obs
● 2026-07-14 16:23:36
● 2026-07-30 18:53:48
●A172.67.177.1952026-07-14 → 2026-07-30 · 3 obs
● 2026-07-14 16:23:36
● 2026-07-30 18:53:48
○A188.114.96.02026-07-14 → 2026-07-14 · 3 obs
○ 2026-07-14 16:23:36
○ 2026-07-30 18:53:48
○A188.114.97.02026-07-14 → 2026-07-14 · 3 obs
○ 2026-07-14 16:23:36
○ 2026-07-30 18:53:48
●A2606:4700:3031::ac43:b1c32026-07-14 → 2026-07-30 · 3 obs
● 2026-07-14 16:23:36
● 2026-07-30 18:53:48
●A2606:4700:3037::6815:1f8e2026-07-14 → 2026-07-30 · 3 obs
● 2026-07-14 16:23:36
● 2026-07-30 18:53:48
○A2a06:98c1:3120::2026-07-14 → 2026-07-14 · 3 obs
○ 2026-07-14 16:23:36
○ 2026-07-30 18:53:48
○A2a06:98c1:3121::2026-07-14 → 2026-07-14 · 3 obs
○ 2026-07-14 16:23:36
○ 2026-07-30 18:53:48
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cc | ac4.nstld.com, ac1.nstld.com, ac2.nstld.com, ac3.nstld.com | - |
| mdbook.cc | grace.ns.cloudflare.com, algin.ns.cloudflare.com | - |
✅ Authoritative Response
Server:172.64.32.159
NS records: grace.ns.cloudflare.com, algin.ns.cloudflare.com
🔒 DNSSEC Status
🔐 Secure (DNSSEC validated)
Chain of trust verified from root to domain
⏱️ Timing
Total: 598ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 2 | 104.21.31.142, 172.67.177.195 |
| AAAA | 2 | 2606:4700:3037::6815:1f8e, 2606:4700:3031::ac43:b1c3 |
| NS | 2 | algin.ns.cloudflare.com, grace.ns.cloudflare.com |
| HTTPS | 1 | {"priority":1,"target":".","alpn":["h3", |
| SOA | 1 | algin.ns.cloudflare.com dns.cloudflare.c |
Analysis
IP Addresses
mdbook.cc points to the four IP addresses 104.21.31.142, 172.67.177.195, 2606:4700:3031::ac43:b1c3 and 2606:4700:3037::6815:1f8e.
www.renrys25.com, boldwavenet.com, coltonreid.com and two other host names share IP numbers with mdbook.cc.
Name Servers
DNS delegation for mdbook.cc points to two name servers: algin.ns.cloudflare.com and grace.ns.cloudflare.com.
mdbook.cc uses the same name servers as several other domains — among them qdbqw.com, giftano.com, bqgeie.cc and two more.
There is at least partial name server overlap between mdbook.cc and other domains — susandalessio.com, puewue.com, hayashi.ca and two more among them.
These name servers frequently co-occur with the name servers pablo.ns.cloudflare.com and arya.ns.cloudflare.com.
Hostnames that resolve to 6 IP addresses:
algin.ns.cloudflare.com has IP addresses 108.162.193.61, 172.64.33.61 and 173.245.59.61, plus 3 other.
grace.ns.cloudflare.com has IP addresses 108.162.192.159, 172.64.32.159 and 173.245.58.159, plus 3 other.