undefinedbehavior.dev - robtex.com

🛡️Domain Reputation CheckBlocklist, phishing & malware status→

undefinedbehavior.dev

DNSSEC⚠️ Not signed
A2606:4700:3031::6815:10e4🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3037::ac43:d882🇺🇸 Cloudflare2606:4700:3037::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.16.228Cloudflare104.21.16.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.216.130🇺🇸 Cloudflare172.67.208.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NSaustin.ns.cloudflare.com ⭐
A2606:4700:58::adf5:3b46🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRaustin.ns.cloudflare.com
A2803:f800:50::6ca2:c146🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTRaustin.ns.cloudflare.com
A2a06:98c1:50::ac40:2146🇺🇸 Cloudflare2a06:98c1:50::/45
PTRaustin.ns.cloudflare.com
A108.162.193.70🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRaustin.ns.cloudflare.com
A172.64.33.70🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRaustin.ns.cloudflare.com
A173.245.59.70🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRaustin.ns.cloudflare.com
NSteresa.ns.cloudflare.com
A2606:4700:50::a29f:26d8🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRteresa.ns.cloudflare.com
A2803:f800:50::6ca2:c2d8🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L
PTRteresa.ns.cloudflare.com
A2a06:98c1:50::ac40:22d8🇺🇸 Cloudflare2a06:98c1:50::/45
PTRteresa.ns.cloudflare.com
A108.162.194.216🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRteresa.ns.cloudflare.com
A162.159.38.216Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRteresa.ns.cloudflare.com
A172.64.34.216🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US
PTRteresa.ns.cloudflare.com
MXmxa.mailgun.org ⭐
A34.149.254.5🇺🇸 Google34.148.0.0/14
PTR5.254.149.34.bc.googleusercontent.com
MXmxb.mailgun.org ⭐
A34.36.182.139🇺🇸 Google34.32.0.0/11
PTR139.182.36.34.bc.googleusercontent.com
TXTv=spf1 include:mailgun.org ~all
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.16.228, 172.67.216.130
IPv6 hints2606:4700:3031::6815:10e4, 2606:4700:3037::ac43:d882
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=91, name=cloudflare-ech.com
SOAaustin.ns.cloudflare.comdns@cloudflare.com serial=2411975232

dev

DNSSEC🔒 Signed (DS record present)
NSns-tld1.charlestonroadregistry.com ⭐
NSns-tld2.charlestonroadregistry.com
NSns-tld3.charlestonroadregistry.com
NSns-tld4.charlestonroadregistry.com
NSns-tld5.charlestonroadregistry.com
SOAns-tld1.charlestonroadregistry.comcloud-dns-hostmaster@google.com serial=1
🔒 HSTS Preload (+subdomains)

Same first word

undefinedbehavior.de
undefinedbehavior.nexus
undefinedbehavior.net
undefinedbehavior.live
undefinedbehavior.io
undefinedbehavior.dev
undefinedbehavior.github.io
undefinedbehavior.shop
undefinedbehavior.com
undefinedbehavior.xyz
undefinedbehavior.wtf

Previous names

undaunted.dev
undaway.dev
undead.dev
undeadinternet.dev
undeadops.dev
undeadpixel.dev
undeadswarm.dev
undeb.dev
undebug.dev
undecided.dev
undecim.dev
undeco.dev
undeefined.dev
undef.dev
undefeatedsoftware.dev
undefine.dev
undefined-labs.dev
undefined-ops.dev
undefined0.dev
undefined443.dev

Next names

undefinedbehaviorexception.dev
undefinedbehaviour.dev
undefinedish.dev
undefinedporcupine.dev
undefinedprophet.dev
undefinedtea.dev
undefprophet.dev
under-construction.dev
under-the-hood.dev
under18.dev
underaft.dev
underaman.dev
underattack.dev
underboss.dev
undercloud.dev
undercode.dev
undercore.dev
undercover.dev
undercroft.dev
undercromo.dev

DNS History

8 records (8 active, 0 former)

NSaustin.ns.cloudflare.comteresa.ns.cloudflare.comMXmxa.mailgun.orgmxb.mailgun.orgA104.21.16.228172.67.216.1302606:4700:3031::6815:10e42606:4700:3037::ac43:d882
●NSaustin.ns.cloudflare.com2026-09-07 → 2026-09-16 · 2 obs
● 2026-09-07 18:45:46
● 2026-09-16 07:17:06
●NSteresa.ns.cloudflare.com2026-09-07 → 2026-09-16 · 2 obs
● 2026-09-07 18:45:46
● 2026-09-16 07:17:06
●MXmxa.mailgun.org2026-09-07 → 2026-09-16 · 2 obs
● 2026-09-07 18:45:46
● 2026-09-16 07:17:06
●MXmxb.mailgun.org2026-09-07 → 2026-09-16 · 2 obs
● 2026-09-07 18:45:46
● 2026-09-16 07:17:06
●A104.21.16.2282026-09-07 → 2026-09-16 · 2 obs
● 2026-09-07 18:45:46
● 2026-09-16 07:17:06
●A172.67.216.1302026-09-07 → 2026-09-16 · 2 obs
● 2026-09-07 18:45:46
● 2026-09-16 07:17:06
●A2606:4700:3031::6815:10e42026-09-07 → 2026-09-16 · 2 obs
● 2026-09-07 18:45:46
● 2026-09-16 07:17:06
●A2606:4700:3037::ac43:d8822026-09-07 → 2026-09-16 · 2 obs
● 2026-09-07 18:45:46
● 2026-09-16 07:17:06

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
devns-tld2.charlestonroadregistry.com, ns-tld5.charlestonroadregistry.com, ns-tld1.charlestonroadregistry.com, ns-tld3.charlestonroadregistry.com...-
undefinedbehavior.devteresa.ns.cloudflare.com, austin.ns.cloudflare.com-

✅ Authoritative Response

Server:173.245.59.70

NS records: teresa.ns.cloudflare.com, austin.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for undefinedbehavior.dev (unsigned zone)

⏱️ Timing

Total: 660ms | Queries: -

📄 Records

TypeCountSample Data
A2172.67.216.130, 104.21.16.228
AAAA22606:4700:3037::ac43:d882, 2606:4700:3031::6815:10e4
NS2austin.ns.cloudflare.com, teresa.ns.cloudflare.com
MX2mxa.mailgun.org (pri: 10), mxb.mailgun.org (pri: 10)
TXT1v=spf1 include:mailgun.org ~all
HTTPS1{"priority":1,"target":".","alpn":["h3",
SOA1austin.ns.cloudflare.com dns.cloudflare.

Analysis

IP Addresses

undefinedbehavior.dev directs to four IP numbers, which are 104.21.16.228, 172.67.216.130, 2606:4700:3031::6815:10e4 and 2606:4700:3037::ac43:d882.

www.getpanel.com, leyuveh.com, suanlihai.com plus two other host names have IP numbers in common with undefinedbehavior.dev.

Name Servers

undefinedbehavior.dev is served by two delegated name servers, austin.ns.cloudflare.com and teresa.ns.cloudflare.com.

The name server configuration of undefinedbehavior.dev is shared with other domains, for instance feyit37167.workers.dev, mainnetdappsolution.pages.dev, dfuel.in and two others.

There is at least partial name server overlap between undefinedbehavior.dev and other domains — nycrypto.co, growcapital.click, delitoto.club and two more among them.

The name servers garret.ns.cloudflare.com, matteo.ns.cloudflare.com and jason.ns.cloudflare.com are often found in combination with these name servers.

Hosts with 6 IP addresses each:

austin.ns.cloudflare.com carries IP addresses 108.162.193.70, 172.64.33.70 and 173.245.59.70, with 3 other addresses beyond those.

teresa.ns.cloudflare.com carries IP addresses 108.162.194.216, 162.159.38.216 and 172.64.34.216, with 3 other addresses beyond those.

Mail Servers

undefinedbehavior.dev uses two mail servers, mxa.mailgun.org and mxb.mailgun.org.

The mail server setup of undefinedbehavior.dev matches that of other domains such as purplecactusonlineinc.com, lashine.ch, maclines.app and two others.

At least some of the mail servers used by undefinedbehavior.dev are shared with other domains: nissan.com.py, myanmarads.net, entschiedengegenkrebs.de and two others among them.

mxa.mailgun.org → 34.149.254.5 and mxb.mailgun.org → 34.36.182.139: one IP number per host name.