`citibike.app`

DNSSEC	⚠️ Not signed
NS	`ns1.nsroot1.com` ⚠️ Not in zone NS records
		A	156.154.64.172^{🇺🇸 MAINT-ID-12008156.154.64.0/24 Neustar}
			PTR	`pdns172.ultradns.com`
NS	`ns2.nsroot2.com` ⚠️ Not in zone NS records
		A	193.108.91.190^{🇳🇱 Akamai193.108.91.0/24 Technologies}
			PTR	`a1-190.akam.net`
			PTR	`ns1-190.akam.net`

`app`

	DNSSEC	🔒 Signed (DS record present)
	NS	`ns-tld1.charlestonroadregistry.com` ⭐
	NS	`ns-tld2.charlestonroadregistry.com`
	NS	`ns-tld3.charlestonroadregistry.com`
	NS	`ns-tld4.charlestonroadregistry.com`
	NS	`ns-tld5.charlestonroadregistry.com`
	SOA	`ns-tld1.charlestonroadregistry.com`cloud-dns-hostmaster@google.com serial=101427

🔒 HSTS Preload (+subdomains)

Same first word

citibike.app

citibike.fr

DNS History

2 records (2 active, 0 former)

●NSns1.nsroot1.com2026-04-28 → 2026-05-13 · 2 obs

● 2026-04-28 23:03:52
● 2026-05-13 05:43:24

●NSns2.nsroot2.com2026-04-28 → 2026-05-13 · 2 obs

● 2026-04-28 23:03:52
● 2026-05-13 05:43:24

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
app	ns-tld2.charlestonroadregistry.com, ns-tld4.charlestonroadregistry.com, ns-tld3.charlestonroadregistry.com, ns-tld1.charlestonroadregistry.com...	-
citibike.app	ns1.nsroot1.com, ns2.nsroot2.com	-

✅ Authoritative Response

Server:156.154.64.172

NS records: ns1.nsroot1.com, ns2.nsroot2.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for citibike.app (unsigned zone)

⏱️ Timing

Total: 483ms | Queries: -

📄 Records

Type	Count	Sample Data

Analysis

Name Servers

Two name servers ns1.nsroot1.com and ns2.nsroot2.com handle the delegation for citibike.app.

citibike.app shares the same name server setup as other domains, for instance citialternativeinvestments.cn, citibankdining.com.au, citibankmonitoringservice.com, citifxpulse.com and citibank.mx.

citibike.app at least partially shares name servers with other domains, for instance citygroup.cl, myciti.co.vi, citigroup.nu, citibank.it and floatindex.com.

These name servers are commonly used alongside ns.citicorp.com, ns5.citicorp.com and ns2.citicorp.com.

Host names with one IP:

ns1.nsroot1.com points to: 156.154.64.172

ns2.nsroot2.com points to: 193.108.91.190

citibike.app - robtex.com

citibike.app

app