openstax.pl - robtex.com

openstax.pl

DNSSEC⚠️ Not signed
A2606:4700:3031::6815:5903🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3036::ac43:9b35🇺🇸 Cloudflare2606:4700:3036::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.89.3Cloudflare104.21.80.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.155.53🇺🇸 Cloudflare172.67.144.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NSdeb.ns.cloudflare.com ⭐
A2606:4700:50::adf5:3a5c🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRdeb.ns.cloudflare.com
A2803:f800:50::6ca2:c05c🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTRdeb.ns.cloudflare.com
A2a06:98c1:50::ac40:205c🇺🇸 Cloudflare2a06:98c1:50::/45
PTRdeb.ns.cloudflare.com
A108.162.192.92🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRdeb.ns.cloudflare.com
A172.64.32.92🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRdeb.ns.cloudflare.com
A173.245.58.92🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRdeb.ns.cloudflare.com
NSivan.ns.cloudflare.com
A2606:4700:58::adf5:3b78🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRivan.ns.cloudflare.com
A2803:f800:50::6ca2:c178🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTRivan.ns.cloudflare.com
A2a06:98c1:50::ac40:2178🇺🇸 Cloudflare2a06:98c1:50::/45
PTRivan.ns.cloudflare.com
A108.162.193.120🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRivan.ns.cloudflare.com
A172.64.33.120🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRivan.ns.cloudflare.com
A173.245.59.120🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRivan.ns.cloudflare.com
MXaspmx.l.google.com ⭐
A2607:f8b0:4004:c27::1a🇺🇸 Google2607:f8b0:4004::/48
PTRyuiadsk-in-f26.1e100.net
A142.251.16.27🇺🇸 Google142.251.16.0/24
PTRbl-in-f27.1e100.net
MXalt1.aspmx.l.google.com(5)
A2800:3f0:4003:c0f::1b🇨🇱 Google2800:3f0:4003::/48
A108.177.123.27🇺🇸 Google108.177.123.0/24
PTRlcscld-in-f27.1e100.net
MXalt2.aspmx.l.google.com(5)
A2a00:1450:400b:c02::1b🇮🇪 Google2a00:1450:400b::/48
PTRdj-in-f27.1e100.net
A172.253.116.26🇺🇸 Google172.253.116.0/24
PTRdj-in-f26.1e100.net
MXalt3.aspmx.l.google.com(10)
A2a00:1450:4009:c0f::1b🇬🇧 Google2a00:1450:4009::/48
PTRyulhrs-in-f27.1e100.net
A192.178.223.27🇺🇸 Google192.178.223.0/24
PTRyulhrs-in-f27.1e100.net
MXalt4.aspmx.l.google.com(10)
A2a00:1450:400c:c23::1a🇧🇪 Google2a00:1450:400c::/48
PTRyubrupd-in-f26.1e100.net
A172.253.157.27🇺🇸 Google172.253.0.0/16
PTRyubrupd-in-f27.1e100.net
TXTgoogle-site-verification=DhZ11dkEkrab0qiztln-g8FFrowWZAzTvKn6XP-Tces
TXTv=spf1 +ip4:193.107.88.136 +ip4:193.107.88.220 +include:_spf.google.com ~all
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.89.3, 172.67.155.53
IPv6 hints2606:4700:3031::6815:5903, 2606:4700:3036::ac43:9b35
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=64, name=cloudflare-ech.com
SOAdeb.ns.cloudflare.comdns@cloudflare.com serial=2411024431

pl

DNSSEC🔒 Signed (DS record present)
NSa-dns.pl ⭐
NSb-dns.pl
NSd-dns.pl
NSf-dns.pl
NSh-dns.pl
NSj-dns.pl
TXTccTLD of Poland
SOAa-dns.pldnsmaster@nask.pl serial=1785738733

Same first word

openstax.mobi
openstax.org
openstax.co
openstax.com
openstax.pl
openstax.us

Similar names

exposant.be
anpostex.net
tano(0x736578)p.com
texanops.com
(0x736578)ontap.com
(0x736578)ontap.net
stonepax.com
ap(0x736578)ton.com
exposant.fr
exposant.nl
santexpo.com
santexpo.fr
exposant.com
nexapost.online
onexpats.com
paxosnet.com
(0x736578)ponat.de
postnexa.com

DNS History

18 records (11 active, 7 former)

20192020202120222023202420252026NSdeb.ns.cloudflare.comivan.ns.cloudflare.comns1.kylos.plns2.kylos.plMXalt1.aspmx.l.google.comalt2.aspmx.l.google.comalt3.aspmx.l.google.comalt4.aspmx.l.google.comaspmx.l.google.comaspmx2.googlemail.comaspmx3.googlemail.comA104.21.89.3172.67.155.532606:4700:3031::6815:59032606:4700:3036::ac43:9b35193.107.88.1922606:4700:3030::6815:59032606:4700:3030::ac43:9b35
●NSdeb.ns.cloudflare.com2026-04-03 → 2026-08-03 · 3 obs
○ 2018-10-25 11:25:34
● 2026-04-03 05:23:34
● 2026-08-03 15:54:38
●NSivan.ns.cloudflare.com2026-04-03 → 2026-08-03 · 3 obs
○ 2018-10-25 11:25:34
● 2026-04-03 05:23:34
● 2026-08-03 15:54:38
○NSns1.kylos.pl2018-10-25 → 2018-10-25 · 3 obs
● 2018-10-25 11:25:34
○ 2026-04-03 05:23:34
○ 2026-08-03 15:54:38
○NSns2.kylos.pl2018-10-25 → 2018-10-25 · 3 obs
● 2018-10-25 11:25:34
○ 2026-04-03 05:23:34
○ 2026-08-03 15:54:38
●MXalt1.aspmx.l.google.com2018-10-25 → 2026-08-03 · 2 obs
● 2018-10-25 11:25:34
● 2026-08-03 15:54:38
●MXalt2.aspmx.l.google.com2018-10-25 → 2026-08-03 · 2 obs
● 2018-10-25 11:25:34
● 2026-08-03 15:54:38
●MXalt3.aspmx.l.google.com2026-04-03 → 2026-08-03 · 3 obs
○ 2018-10-25 11:25:34
● 2026-04-03 05:23:34
● 2026-08-03 15:54:38
●MXalt4.aspmx.l.google.com2026-04-03 → 2026-08-03 · 3 obs
○ 2018-10-25 11:25:34
● 2026-04-03 05:23:34
● 2026-08-03 15:54:38
●MXaspmx.l.google.com2018-10-25 → 2026-08-03 · 2 obs
● 2018-10-25 11:25:34
● 2026-08-03 15:54:38
○MXaspmx2.googlemail.com2018-10-25 → 2018-10-25 · 3 obs
● 2018-10-25 11:25:34
○ 2026-04-03 05:23:34
○ 2026-08-03 15:54:38
○MXaspmx3.googlemail.com2018-10-25 → 2018-10-25 · 3 obs
● 2018-10-25 11:25:34
○ 2026-04-03 05:23:34
○ 2026-08-03 15:54:38
●A104.21.89.32026-04-03 → 2026-08-03 · 3 obs
○ 2018-10-25 11:25:34
● 2026-04-03 05:23:34
● 2026-08-03 15:54:38
●A172.67.155.532026-04-03 → 2026-08-03 · 3 obs
○ 2018-10-25 11:25:34
● 2026-04-03 05:23:34
● 2026-08-03 15:54:38
○A193.107.88.1922018-10-25 → 2018-10-25 · 3 obs
● 2018-10-25 11:25:34
○ 2026-04-03 05:23:34
○ 2026-08-03 15:54:38
○A2606:4700:3030::6815:59032026-04-03 → 2026-04-03 · 4 obs
○ 2018-10-25 11:25:34
● 2026-04-03 05:23:34
○ 2026-07-04 21:19:04
○ 2026-08-03 15:54:38
○A2606:4700:3030::ac43:9b352026-04-03 → 2026-04-03 · 4 obs
○ 2018-10-25 11:25:34
● 2026-04-03 05:23:34
○ 2026-07-04 21:19:04
○ 2026-08-03 15:54:38
●A2606:4700:3031::6815:59032026-07-04 → 2026-08-03 · 3 obs
○ 2026-04-03 05:23:34
● 2026-07-04 21:19:04
● 2026-08-03 15:54:38
●A2606:4700:3036::ac43:9b352026-07-04 → 2026-08-03 · 3 obs
○ 2026-04-03 05:23:34
● 2026-07-04 21:19:04
● 2026-08-03 15:54:38

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
pla-dns.pl, b-dns.pl, d-dns.pl, f-dns.pl...-
openstax.plivan.ns.cloudflare.com, deb.ns.cloudflare.com-

✅ Authoritative Response

Server:173.245.59.120

NS records: ivan.ns.cloudflare.com, deb.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for openstax.pl (unsigned zone)

⏱️ Timing

Total: 635ms | Queries: -

📄 Records

TypeCountSample Data
A2104.21.89.3, 172.67.155.53
AAAA22606:4700:3036::ac43:9b35, 2606:4700:3031::6815:5903
NS2deb.ns.cloudflare.com, ivan.ns.cloudflare.com
MX5aspmx.l.google.com (pri: 1), alt3.aspmx.l.google.com (pri: 10)...
TXT2google-site-verification=DhZ11dkEkrab0qi, v=spf1 +ip4:193.107.88.136 +ip4:193.107.
HTTPS1{"priority":1,"target":".","alpn":["h3",
SOA1deb.ns.cloudflare.com dns.cloudflare.com

Analysis

IP Addresses

openstax.pl resolves to four IP addresses: 104.21.89.3, 172.67.155.53, 2606:4700:3031::6815:5903 and 2606:4700:3036::ac43:9b35.

Additional host names — hotlattes.com, shinenet.co.uk, beliniarredamento.it and two others — share IP numbers with openstax.pl.

Name Servers

openstax.pl has two authoritative name servers — deb.ns.cloudflare.com and ivan.ns.cloudflare.com.

openstax.pl shares its name server setup with other domains, including soaps.net.au, vuvale.com.fj, national-precision.com and two others.

openstax.pl has at least partial name server overlap with other domains, such as shareinstock.com, nanguankv.com, acces691063.pro and two others.

It is common to find these name servers paired with the name servers erin.ns.cloudflare.com, lakas.ns.cloudflare.com, hans.ns.cloudflare.com and nolan.ns.cloudflare.com.

Host names with 6 IP numbers:

deb.ns.cloudflare.com points to 108.162.192.92, 172.64.32.92, 173.245.58.92 and 3 other IP addresses.

ivan.ns.cloudflare.com points to 108.162.193.120, 172.64.33.120, 173.245.59.120 and 3 other IP addresses.

Mail Servers

openstax.pl is handled by five mail servers: aspmx.l.google.com, alt1.aspmx.l.google.com, alt2.aspmx.l.google.com and two others.

openstax.pl shares mail servers — at least in part — with other domains, including ns500698.ns500759.ns500698.ns500759.ns500735.ns500698.ns500698.ns500736.ns500708.ns500576.ns500619.ns500576.ns500576.trackreceptor.com, ns500734.ns500693.ns500699.ns500693.ns500699.ns500693.ns500699.ns500588.ns500693.ns500693.ns500699.ns500699.ns500683.ns500588.ns500612.ns500588.ns500110.dtrkdll.com, pateo.jp and two others.

These mail servers are frequently used alongside mail servers alt3.aspmx.l.google.com, alt4.aspmx.l.google.com, aspmx2.googlemail.com and 3 other.

Host names with two IP numbers:

aspmx.l.google.com resolves to 142.251.16.27 and 2607:f8b0:4004:c27::1a.

alt1.aspmx.l.google.com resolves to 108.177.123.27 and 2800:3f0:4003:c0f::1b.

alt2.aspmx.l.google.com resolves to 172.253.116.26 and 2a00:1450:400b:c02::1b.

alt3.aspmx.l.google.com resolves to 192.178.223.27 and 2a00:1450:4009:c0f::1b.

alt4.aspmx.l.google.com resolves to 172.253.157.27 and 2a00:1450:400c:c23::1a.