studyguide.com - robtex.com
studyguide.com
| DNSSEC | ⚠️ Not signed | ||||||
| NS | ns-1821.awsdns-35.co.uk ⭐ | ||||||
| A | 2600:9000:5307:1d00::1🇺🇸 Amazon2600:9000:5307::/48 - CloudFront | ||||||
| PTR | ns-1821.awsdns-35.co.uk | ||||||
| A | 205.251.199.29🇺🇸 Amazon205.251.199.0/24 prefix | ||||||
| PTR | ns-1821.awsdns-35.co.uk | ||||||
| NS | ns-1331.awsdns-38.org | ||||||
| A | 2600:9000:5305:3300::1🇺🇸 Amazon2600:9000:5305::/48 - CloudFront | ||||||
| PTR | ns-1331.awsdns-38.org | ||||||
| A | 205.251.197.51🇺🇸 Amazon205.251.197.0/24 prefix | ||||||
| PTR | ns-1331.awsdns-38.org | ||||||
| NS | ns-426.awsdns-53.com | ||||||
| A | 2600:9000:5301:aa00::1🇺🇸 Amazon2600:9000:5301::/48 - CloudFront | ||||||
| PTR | ns-426.awsdns-53.com | ||||||
| A | 205.251.193.170🇺🇸 Amazon205.251.193.0/24 prefix | ||||||
| PTR | ns-426.awsdns-53.com | ||||||
| NS | ns-649.awsdns-17.net | ||||||
| A | 2600:9000:5302:8900::1🇺🇸 Amazon2600:9000:5302::/48 - CloudFront | ||||||
| PTR | ns-649.awsdns-17.net | ||||||
| A | 205.251.194.137🇺🇸 Amazon205.251.194.0/24 prefix | ||||||
| PTR | ns-649.awsdns-17.net | ||||||
| TXT | v=spf1 -all | ||||||
| SOA | ns-1821.awsdns-35.co.ukawsdns-hostmaster@amazon.com serial=1 | ||||||
com
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a.gtld-servers.net ⭐ | ||||||
| NS | b.gtld-servers.net | ||||||
| NS | c.gtld-servers.net | ||||||
| NS | d.gtld-servers.net | ||||||
| NS | e.gtld-servers.net | ||||||
| NS | f.gtld-servers.net | ||||||
| NS | g.gtld-servers.net | ||||||
| NS | h.gtld-servers.net | ||||||
| NS | i.gtld-servers.net | ||||||
| NS | j.gtld-servers.net | ||||||
| NS | k.gtld-servers.net | ||||||
| NS | l.gtld-servers.net | ||||||
| NS | m.gtld-servers.net | ||||||
| SOA | a.gtld-servers.netnstld@verisign-grs.com serial=1786417789 | ||||||
Same first word
studyguide.ca |
studyguide.co.in |
studyguide.org |
studyguide.ch |
studyguide.at |
studyguide.cn |
studyguide.co |
studyguide.us |
studyguide.de |
studyguide.gr |
studyguide.net |
studyguide.eu |
studyguide.com |
Similar names
DNS History
14 records (4 active, 10 former)
●NSns-1331.awsdns-38.org2026-03-26 → 2026-08-11 · 3 obs
● 2026-03-26 10:14:22
● 2026-08-11 03:30:04
●NSns-1821.awsdns-35.co.uk2026-03-26 → 2026-08-11 · 3 obs
● 2026-03-26 10:14:22
● 2026-08-11 03:30:04
●NSns-426.awsdns-53.com2026-03-26 → 2026-08-11 · 3 obs
● 2026-03-26 10:14:22
● 2026-08-11 03:30:04
●NSns-649.awsdns-17.net2026-03-26 → 2026-08-11 · 3 obs
● 2026-03-26 10:14:22
● 2026-08-11 03:30:04
○NSns97.worldnic.com2015-08-22 → 2017-05-21 · 4 obs
● 2017-05-21 15:35:38
○ 2026-03-26 10:14:22
○ 2026-08-11 03:30:04
○NSns98.worldnic.com2015-08-22 → 2017-05-21 · 4 obs
● 2017-05-21 15:35:38
○ 2026-03-26 10:14:22
○ 2026-08-11 03:30:04
○MXs7a1.psmtp.com2015-08-22 → 2017-05-21 · 4 obs
● 2017-05-21 15:35:38
○ 2026-03-26 10:14:22
○ 2026-08-11 03:30:04
○MXs7a2.psmtp.com2015-08-22 → 2017-05-21 · 4 obs
● 2017-05-21 15:35:38
○ 2026-03-26 10:14:22
○ 2026-08-11 03:30:04
○MXs7b1.psmtp.com2015-08-22 → 2017-05-21 · 4 obs
● 2017-05-21 15:35:38
○ 2026-03-26 10:14:22
○ 2026-08-11 03:30:04
○MXs7b2.psmtp.com2015-08-22 → 2017-05-21 · 4 obs
● 2017-05-21 15:35:38
○ 2026-03-26 10:14:22
○ 2026-08-11 03:30:04
○A216.239.32.212015-08-22 → 2017-05-21 · 4 obs
● 2017-05-21 15:35:38
○ 2026-03-26 10:14:22
○ 2026-08-11 03:30:04
○A216.239.34.212015-08-22 → 2017-05-21 · 4 obs
● 2017-05-21 15:35:38
○ 2026-03-26 10:14:22
○ 2026-08-11 03:30:04
○A216.239.36.212015-08-22 → 2017-05-21 · 4 obs
● 2017-05-21 15:35:38
○ 2026-03-26 10:14:22
○ 2026-08-11 03:30:04
○A216.239.38.212015-08-22 → 2017-05-21 · 4 obs
● 2017-05-21 15:35:38
○ 2026-03-26 10:14:22
○ 2026-08-11 03:30:04
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | c.gtld-servers.net, h.gtld-servers.net, d.gtld-servers.net, f.gtld-servers.net... | - |
| studyguide.com | ns-649.awsdns-17.net, ns-426.awsdns-53.com, ns-1821.awsdns-35.co.uk, ns-1331.awsdns-38.org | 2 records |
✅ Authoritative Response
Server:205.251.197.51
NS records: ns-649.awsdns-17.net, ns-426.awsdns-53.com, ns-1821.awsdns-35.co.uk, ns-1331.awsdns-38.org
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for studyguide.com (unsigned zone)
⏱️ Timing
Total: 290ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| NS | 4 | ns-1331.awsdns-38.org, ns-1821.awsdns-35.co.uk... |
| MX | 1 | . (pri: 0) |
| TXT | 1 | v=spf1 -all |
| SOA | 1 | ns-1821.awsdns-35.co.uk awsdns-hostmaste |
📌 Glue Records Collected
Total: 2
Out-of-bailiwick: 2 (ns-426.awsdns-53.com, ns-426.awsdns-53.com)
Analysis
Name Servers
The domain studyguide.com is delegated to these four name servers: ns-426.awsdns-53.com, ns-649.awsdns-17.net, ns-1331.awsdns-38.org and ns-1821.awsdns-35.co.uk.
The name servers of studyguide.com overlap at least partially with those of other domains — among them 169.32.63.in-addr.arpa, 17.208.66.in-addr.arpa, mrzen.com and two more.
These name servers commonly co-occur with the name servers ns1-24-eu-west-1.ec2-rdns.amazonaws.com, ns2-24-eu-west-1.ec2-rdns.amazonaws.com, ns3-24-eu-west-1.ec2-rdns.amazonaws.com and ns4-24-eu-west-1.ec2-rdns.amazonaws.com.
Each of the four hosts ns-426.awsdns-53.com, ns-649.awsdns-17.net, ns-1331.awsdns-38.org and ns-1821.awsdns-35.co.uk has two IP addresses. ns-426.awsdns-53.com points to 205.251.193.170 and 2600:9000:5301:aa00::1. ns-649.awsdns-17.net points to 205.251.194.137 and 2600:9000:5302:8900::1. ns-1331.awsdns-38.org points to 205.251.197.51 and 2600:9000:5305:3300::1. ns-1821.awsdns-35.co.uk points to 205.251.199.29 and 2600:9000:5307:1d00::1.