undefinedbehavior.dev - dns.ninja

🛡️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=180, name=cloudflare-ech.com
SOAaustin.ns.cloudflare.comdns@cloudflare.com serial=2416147984

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.co.uk
undefinedbehavior.live
undefinedbehavior.io
undefinedbehavior.dev
undefinedbehavior.github.io
undefinedbehavior.shop
undefinedbehavior.com
undefinedbehavior.xyz
undefinedbehavior.wtf

Previous names

undaway.dev
undead.dev
undeadinternet.dev
undeadops.dev
undeadpixel.dev
undeadswarm.dev
undeb.dev
undebug.dev
undecide.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
undefinedlabs.dev
undefinedporcupine.dev
undefinedprophet.dev
undefinedtea.dev
undefprophet.dev
undeleted.dev
undependent.dev
under-construction.dev
under-the-hood.dev
under18.dev
underaft.dev
underaman.dev
underattack.dev
underboss.dev
undercaffeinated.dev
underclass.dev
undercloud.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 → 2026-10-02 · 2 obs
● 2026-09-07 18:45:46
● 2026-10-02 09:48:20
●NSteresa.ns.cloudflare.com2026-09-07 → 2026-10-02 · 2 obs
● 2026-09-07 18:45:46
● 2026-10-02 09:48:20
●MXmxa.mailgun.org2026-09-07 → 2026-10-02 · 2 obs
● 2026-09-07 18:45:46
● 2026-10-02 09:48:20
●MXmxb.mailgun.org2026-09-07 → 2026-10-02 · 2 obs
● 2026-09-07 18:45:46
● 2026-10-02 09:48:20
●A104.21.16.2282026-09-07 → 2026-10-02 · 2 obs
● 2026-09-07 18:45:46
● 2026-10-02 09:48:20
●A172.67.216.1302026-09-07 → 2026-10-02 · 2 obs
● 2026-09-07 18:45:46
● 2026-10-02 09:48:20
●A2606:4700:3031::6815:10e42026-09-07 → 2026-10-02 · 2 obs
● 2026-09-07 18:45:46
● 2026-10-02 09:48:20
●A2606:4700:3037::ac43:d8822026-09-07 → 2026-10-02 · 2 obs
● 2026-09-07 18:45:46
● 2026-10-02 09:48:20

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
devns-tld2.charlestonroadregistry.com, ns-tld4.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: 1131ms | Queries: -

📄 Records

TypeCountSample Data
A2104.21.16.228, 172.67.216.130
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 resolves to four IP addresses: 104.21.16.228, 172.67.216.130, 2606:4700:3031::6815:10e4 and 2606:4700:3037::ac43:d882.

Additional host names — sv366ss.com, www.getpanel.com, leyuveh.com and two others — share IP numbers with undefinedbehavior.dev.

Name Servers

undefinedbehavior.dev has two authoritative name servers — austin.ns.cloudflare.com and teresa.ns.cloudflare.com.

undefinedbehavior.dev shares its name server setup with other domains, including produitscoiffureremise.com, feyit37167.workers.dev, mainnetdappsolution.pages.dev and two others.

undefinedbehavior.dev partially shares its NS delegation with several other domains, including 5115020.com, nycrypto.co, growcapital.click and two others.

These name servers regularly co-occur with the name servers matteo.ns.cloudflare.com, garret.ns.cloudflare.com and jason.ns.cloudflare.com.

Host names with 6 IP numbers:

austin.ns.cloudflare.com points to 108.162.193.70, 172.64.33.70, 173.245.59.70 and 3 other IP addresses.

teresa.ns.cloudflare.com points to 108.162.194.216, 162.159.38.216, 172.64.34.216 and 3 other IP addresses.

Mail Servers

undefinedbehavior.dev has two mail servers: mxa.mailgun.org and mxb.mailgun.org.

undefinedbehavior.dev shares the same mail server setup as other domains, including purplecactusonlineinc.com, dyantjhia.com, lashine.ch and two others.

The MX records for undefinedbehavior.dev are at least partially shared with other domains, such as nissan.com.py, myanmarads.net, entschiedengegenkrebs.de and lunarmedia.co.

mxa.mailgun.org resolves to 34.149.254.5. mxb.mailgun.org resolves to 34.36.182.139. Both host names point to a single IP number.