firstbooks.cn - robtex.com

firstbooks.cn

DNSSEC⚠️ Not signed
A2606:4700:3030::ac43:c457🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3033::6815:1520🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.21.32Cloudflare104.21.16.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.196.87🇺🇸 Cloudflare172.67.192.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NSdorthy.ns.cloudflare.com ⭐
A2606:4700:50::adf5:3af9🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRdorthy.ns.cloudflare.com
A2803:f800:50::6ca2:c0f9🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTRdorthy.ns.cloudflare.com
A2a06:98c1:50::ac40:20f9🇺🇸 Cloudflare2a06:98c1:50::/45
PTRdorthy.ns.cloudflare.com
A108.162.192.249🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRdorthy.ns.cloudflare.com
A172.64.32.249🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRdorthy.ns.cloudflare.com
A173.245.58.249🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRdorthy.ns.cloudflare.com
NSrayden.ns.cloudflare.com
A2606:4700:58::a29f:2ca3🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRrayden.ns.cloudflare.com
A2803:f800:50::6ca2:c3a3🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTRrayden.ns.cloudflare.com
A2a06:98c1:50::ac40:23a3🇺🇸 Cloudflare2a06:98c1:50::/45
PTRrayden.ns.cloudflare.com
A108.162.195.163🇺🇸 Cloudflare108.162.195.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRrayden.ns.cloudflare.com
A162.159.44.163Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRrayden.ns.cloudflare.com
A172.64.35.163🇺🇸 Cloudflare172.64.35.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRrayden.ns.cloudflare.com
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.21.32, 172.67.196.87
IPv6 hints2606:4700:3030::ac43:c457, 2606:4700:3033::6815:1520
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=127, name=cloudflare-ech.com
SOAdorthy.ns.cloudflare.comdns@cloudflare.com serial=2403839019

cn

DNSSEC🔒 Signed (DS record present)
NSa.dns.cn ⭐
NSb.dns.cn
NSc.dns.cn
NSd.dns.cn
NSe.dns.cn
NSns.cernet.net ⚠️ Not in parent delegation
SOAa.dns.cnroot@cnnic.cn serial=2034782760

Same first word

firstbooks.co.uk
firstbooks.net
firstbooks.com
firstbooks.org
firstbooks.cn
firstbooks.ru

Similar names

robskisoft.com

DNS History

11 records (6 active, 5 former)

20192020202120222023202420252026NSdorthy.ns.cloudflare.comrayden.ns.cloudflare.comdns27.hichina.comdns28.hichina.comMXmxn.mxhichina.commxw.mxhichina.comA104.21.21.32172.67.196.872606:4700:3030::ac43:c4572606:4700:3033::6815:152060.205.40.99
○NSdns27.hichina.com2018-07-29 → 2018-07-29 · 3 obs
● 2018-07-29 09:36:58
○ 2026-03-31 13:47:40
○ 2026-05-12 12:06:56
○NSdns28.hichina.com2018-07-29 → 2018-07-29 · 3 obs
● 2018-07-29 09:36:58
○ 2026-03-31 13:47:40
○ 2026-05-12 12:06:56
●NSdorthy.ns.cloudflare.com2026-03-31 → 2026-05-12 · 3 obs
○ 2018-07-29 09:36:58
● 2026-03-31 13:47:40
● 2026-05-12 12:06:56
●NSrayden.ns.cloudflare.com2026-03-31 → 2026-05-12 · 3 obs
○ 2018-07-29 09:36:58
● 2026-03-31 13:47:40
● 2026-05-12 12:06:56
○MXmxn.mxhichina.com2018-07-29 → 2018-07-29 · 3 obs
● 2018-07-29 09:36:58
○ 2026-03-31 13:47:40
○ 2026-05-12 12:06:56
○MXmxw.mxhichina.com2018-07-29 → 2018-07-29 · 3 obs
● 2018-07-29 09:36:58
○ 2026-03-31 13:47:40
○ 2026-05-12 12:06:56
●A104.21.21.322026-03-31 → 2026-05-12 · 3 obs
○ 2018-07-29 09:36:58
● 2026-03-31 13:47:40
● 2026-05-12 12:06:56
●A172.67.196.872026-03-31 → 2026-05-12 · 3 obs
○ 2018-07-29 09:36:58
● 2026-03-31 13:47:40
● 2026-05-12 12:06:56
●A2606:4700:3030::ac43:c4572026-03-31 → 2026-05-12 · 3 obs
○ 2018-07-29 09:36:58
● 2026-03-31 13:47:40
● 2026-05-12 12:06:56
●A2606:4700:3033::6815:15202026-03-31 → 2026-05-12 · 3 obs
○ 2018-07-29 09:36:58
● 2026-03-31 13:47:40
● 2026-05-12 12:06:56
○A60.205.40.992018-07-29 → 2018-07-29 · 3 obs
● 2018-07-29 09:36:58
○ 2026-03-31 13:47:40
○ 2026-05-12 12:06:56

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
cnd.dns.cn, e.dns.cn, a.dns.cn, c.dns.cn...-
firstbooks.cndorthy.ns.cloudflare.com, rayden.ns.cloudflare.com-

✅ Authoritative Response

Server:173.245.58.249

NS records: dorthy.ns.cloudflare.com, rayden.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for firstbooks.cn (unsigned zone)

⏱️ Timing

Total: 1037ms | Queries: -

📄 Records

TypeCountSample Data
A2104.21.21.32, 172.67.196.87
AAAA22606:4700:3030::ac43:c457, 2606:4700:3033::6815:1520
NS2dorthy.ns.cloudflare.com, rayden.ns.cloudflare.com
HTTPS1{"priority":1,"target":".","alpn":["h3",
SOA1dorthy.ns.cloudflare.com dns.cloudflare.

Analysis

IP Addresses

firstbooks.cn points to four IP numbers: 2606:4700:3030::ac43:c457, 2606:4700:3033::6815:1520, 104.21.21.32 and 172.67.196.87.

Other host names, for instance mail.freesteamkeys.com, scaletecindia.com, loginadmin.net, levendwoord.nl and crmwy.xyz share IP numbers with firstbooks.cn.

Name Servers

firstbooks.cn is delegated to two name servers: dorthy.ns.cloudflare.com and rayden.ns.cloudflare.com.

firstbooks.cn uses the same name server setup as other domains, for instance huibao2buy.com, wintei.com, 51tmp.cn, lvbo.net.cn and bjtszl.com.

firstbooks.cn shares name servers with other domains at least partially, for instance aspencorporatehealth.com.au, apsp.org.cn, cdh.com.uy, nmrsw2.ac.th and autoteilexxl.ch.

these name servers are commonly used together with jen.ns.cloudflare.com and dayana.ns.cloudflare.com.

Host names with six IP numbers: dorthy.ns.cloudflare.com points to 2606:4700:50::adf5:3af9, 2803:f800:50::6ca2:c0f9, 2a06:98c1:50::ac40:20f9, 108.162.192.249, 172.64.32.249 and 173.245.58.249; rayden.ns.cloudflare.com points to 2606:4700:58::a29f:2ca3, 2803:f800:50::6ca2:c3a3, 2a06:98c1:50::ac40:23a3, 108.162.195.163, 162.159.44.163 and 172.64.35.163.