studyguide.dev - dns.ninja
studyguide.dev
| DNSSEC | ⚠️ Not signed | ||||||
| A | 143.198.193.21🇸🇬 DIGITALOCEAN143.198.192.0/20 DigitalOcean | ||||||
| NS | annalise.ns.cloudflare.com ⭐ | ||||||
| A | 2606:4700:50::a29f:26ea🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | annalise.ns.cloudflare.com | ||||||
| A | 2803:f800:50::6ca2:c2ea🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L | ||||||
| PTR | annalise.ns.cloudflare.com | ||||||
| A | 2a06:98c1:50::ac40:22ea🇺🇸 Cloudflare2a06:98c1:50::/45 | ||||||
| PTR | annalise.ns.cloudflare.com | ||||||
| A | 108.162.194.234🇺🇸 Cloudflare108.162.194.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | annalise.ns.cloudflare.com | ||||||
| A | 162.159.38.234Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | annalise.ns.cloudflare.com | ||||||
| A | 172.64.34.234🇺🇸 Cloudflare172.64.34.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | annalise.ns.cloudflare.com | ||||||
| NS | denver.ns.cloudflare.com | ||||||
| A | 2606:4700:58::a29f:2cc4🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | denver.ns.cloudflare.com | ||||||
| A | 2803:f800:50::6ca2:c3c4🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L | ||||||
| PTR | denver.ns.cloudflare.com | ||||||
| A | 2a06:98c1:50::ac40:23c4🇺🇸 Cloudflare2a06:98c1:50::/45 | ||||||
| PTR | denver.ns.cloudflare.com | ||||||
| A | 108.162.195.196🇺🇸 Cloudflare108.162.195.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | denver.ns.cloudflare.com | ||||||
| A | 162.159.44.196Cloudflare162.159.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | denver.ns.cloudflare.com | ||||||
| A | 172.64.35.196🇺🇸 Cloudflare172.64.35.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | denver.ns.cloudflare.com | ||||||
| MX | mail.studyguide.dev ⭐ | ||||||
| A | 61.28.233.9🇻🇳 CMC-461.28.233.0/24 Vietnam Internet Network Information Center (VNNIC) 18 Nguyen Du Str, Hai Ba Trung District, Hanoi City, Vietnam 24th floor, VNTA Tower, Duong Dinh Nghe, Cau Giay, Hanoi | ||||||
| MX | mx1.onemail.vn(5) | ||||||
| A | 103.216.116.14🇻🇳 VNPT-AS-VN103.216.116.0/22 INETSOFT-VN | ||||||
| PTR | mx1.smtp-in.onemail.vn | ||||||
| MX | mx2.onemail.vn(5) | ||||||
| A | 103.72.96.29🇻🇳 INETSOFT-AS-VN103.72.96.0/22 INETSOFT-VN | ||||||
| PTR | mx2.smtp-in.onemail.vn | ||||||
| MX | mx3.onemail.vn(5) | ||||||
| A | 103.56.162.10🇻🇳 VNPT-AS-VN103.56.160.0/22 INETSOFT-VN | ||||||
| PTR | mx3.smtp-in.onemail.vn | ||||||
| TXT | v=spf1 +mx +a +ip4:61.28.233.9 ~all | ||||||
| TXT | v=spf1 include:_spf.onemail.vn ~all | ||||||
| TXT | zalo-platform-site-verification=ODovUAJP2cH2zO5jmzq9EX_ZeYBpbNHwCpar | ||||||
| SOA | annalise.ns.cloudflare.comdns@cloudflare.com serial=2413613955 | ||||||
dev
| 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.comcloud-dns-hostmaster@google.com serial=1 | ||||||
Subdomains
mail.studyguide.dev |
Same first word
Similar names
Previous names
Next names
DNS History
7 records (7 active, 0 former)
●NSannalise.ns.cloudflare.com2026-08-29 → 2026-09-01 · 2 obs
● 2026-09-01 06:09:58
●NSdenver.ns.cloudflare.com2026-08-29 → 2026-09-01 · 2 obs
● 2026-09-01 06:09:58
●MXmail.studyguide.dev2026-08-29 → 2026-09-01 · 2 obs
● 2026-09-01 06:09:58
●MXmx1.onemail.vn2026-08-29 → 2026-09-01 · 2 obs
● 2026-09-01 06:09:58
●MXmx2.onemail.vn2026-08-29 → 2026-09-01 · 2 obs
● 2026-09-01 06:09:58
●MXmx3.onemail.vn2026-08-29 → 2026-09-01 · 2 obs
● 2026-09-01 06:09:58
●A143.198.193.212026-08-29 → 2026-09-01 · 2 obs
● 2026-09-01 06:09:58
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| dev | ns-tld1.charlestonroadregistry.com, ns-tld3.charlestonroadregistry.com, ns-tld5.charlestonroadregistry.com, ns-tld2.charlestonroadregistry.com... | 10 records |
| studyguide.dev | denver.ns.cloudflare.com, annalise.ns.cloudflare.com | - |
✅ Authoritative Response
Server:108.162.195.196
NS records: denver.ns.cloudflare.com, annalise.ns.cloudflare.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for studyguide.dev (unsigned zone)
⏱️ Timing
Total: 1768ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 143.198.193.21 |
| NS | 2 | annalise.ns.cloudflare.com, denver.ns.cloudflare.com |
| MX | 4 | mail.studyguide.dev (pri: 1), mx1.onemail.vn (pri: 5)... |
| TXT | 3 | v=spf1 +mx +a +ip4:61.28.233.9 ~all, v=spf1 include:_spf.onemail.vn ~all... |
| SOA | 1 | annalise.ns.cloudflare.com dns.cloudflar |
📌 Glue Records Collected
Total: 10
Out-of-bailiwick: 10 (ns-tld1.charlestonroadregistry.com, ns-tld1.charlestonroadregistry.com, ns-tld3.charlestonroadregistry.com...)
Analysis
Hierarchy
The domain mail.studyguide.dev falls under the parent studyguide.dev.
IP Addresses
studyguide.dev resolves to just one IP address, 143.198.193.21.
eduplanner.ca, for instance, is one of the other host names sharing IP numbers with studyguide.dev.
Name Servers
studyguide.dev uses two name servers for its delegation: annalise.ns.cloudflare.com and denver.ns.cloudflare.com.
studyguide.dev shares its NS records with other domains, for example 5esrlt.pages.dev, mapleeduverse.com, stlmobiletech.com and two others.
At least some of studyguide.dev's name servers are shared with other domains, for example kaluhiskitchen.com, miaventilation.vn, mailllllll.pages.dev and two more.
These name servers tend to co-occur with noah.ns.cloudflare.com, susan.ns.cloudflare.com, lily.ns.cloudflare.com and 3 other name servers in the same DNS delegations.
DNS names with 6 IP addresses:
Hostname annalise.ns.cloudflare.com directs to 108.162.194.234, 162.159.38.234 and 172.64.34.234 along with 3 other IP addresses.
Hostname denver.ns.cloudflare.com directs to 108.162.195.196, 162.159.44.196 and 172.64.35.196 along with 3 other IP addresses.
Mail Servers
The four mail servers for studyguide.dev are mail.studyguide.dev, mx1.onemail.vn, mx2.onemail.vn and mx3.onemail.vn.
There is at least a partial MX overlap between studyguide.dev and other domains, including truongthinhmotors.com, hivn.vn, mktsoftware.vn and two others.
These mail servers often co-occur with the mail servers mx.inet.vn.
The hosts mail.studyguide.dev, mx1.onemail.vn, mx2.onemail.vn and mx3.onemail.vn all resolve to exactly one IP address each: 61.28.233.9, 103.216.116.14, 103.72.96.29 and 103.56.162.10 respectively.