atcoder.com - robtex.com
atcoder.com
| DNSSEC | ⚠️ Not signed | ||||||
| NS | ns-1460.awsdns-54.org ⚠️ Not in zone NS records | ||||||
| A | 2600:9000:5305:b400::1🇺🇸 Amazon2600:9000:5305::/48 - CloudFront | ||||||
| PTR | ns-1460.awsdns-54.org | ||||||
| A | 205.251.197.180🇺🇸 Amazon205.251.197.0/24 prefix | ||||||
| PTR | ns-1460.awsdns-54.org | ||||||
| NS | ns-17.awsdns-02.com ⚠️ Not in zone NS records | ||||||
| A | 2600:9000:5300:1100::1🇺🇸 Amazon2600:9000:5300::/48 - CloudFront | ||||||
| PTR | ns-17.awsdns-02.com | ||||||
| A | 205.251.192.17🇺🇸 Amazon205.251.192.0/24 prefix | ||||||
| PTR | ns-17.awsdns-02.com | ||||||
| NS | ns-1760.awsdns-28.co.uk ⚠️ Not in zone NS records | ||||||
| A | 2600:9000:5306:e000::1🇺🇸 Amazon2600:9000:5306::/48 - CloudFront | ||||||
| PTR | ns-1760.awsdns-28.co.uk | ||||||
| A | 205.251.198.224🇺🇸 Amazon205.251.198.0/24 prefix | ||||||
| PTR | ns-1760.awsdns-28.co.uk | ||||||
| NS | ns-883.awsdns-46.net ⚠️ Not in zone NS records | ||||||
| A | 2600:9000:5303:7300::1🇺🇸 Amazon2600:9000:5303::/48 - CloudFront | ||||||
| PTR | ns-883.awsdns-46.net | ||||||
| A | 205.251.195.115🇺🇸 Amazon205.251.195.0/24 prefix | ||||||
| PTR | ns-883.awsdns-46.net | ||||||
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=1787566636 | ||||||
Same first word
Similar names
Previous names
Next names
DNS History
6 records (4 active, 2 former)
●NSns-1460.awsdns-54.org2015-07-08 → 2026-08-24 · 2 obs
● 2026-08-24 10:31:28
●NSns-17.awsdns-02.com2015-07-08 → 2026-08-24 · 2 obs
● 2026-08-24 10:31:28
●NSns-1760.awsdns-28.co.uk2015-07-08 → 2026-08-24 · 2 obs
● 2026-08-24 10:31:28
●NSns-883.awsdns-46.net2015-07-08 → 2026-08-24 · 2 obs
● 2026-08-24 10:31:28
○A54.250.128.1122015-07-08 → 2015-07-08 · 3 obs
○ 2015-11-28 12:15:58
○ 2026-08-24 10:31:28
○A54.92.2.2082015-07-08 → 2015-07-08 · 3 obs
○ 2015-11-28 12:15:58
○ 2026-08-24 10:31:28
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | a.gtld-servers.net, d.gtld-servers.net, h.gtld-servers.net, g.gtld-servers.net... | - |
| atcoder.com | ns-17.awsdns-02.com, ns-883.awsdns-46.net, ns-1760.awsdns-28.co.uk, ns-1460.awsdns-54.org | 2 records |
✅ Authoritative Response
Server:205.251.197.180
NS records: ns-17.awsdns-02.com, ns-883.awsdns-46.net, ns-1760.awsdns-28.co.uk, ns-1460.awsdns-54.org
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for atcoder.com (unsigned zone)
⏱️ Timing
Total: 213ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|
📌 Glue Records Collected
Total: 2
Out-of-bailiwick: 2 (ns-17.awsdns-02.com, ns-17.awsdns-02.com)
Analysis
Name Servers
The domain atcoder.com is delegated to these four name servers: ns-17.awsdns-02.com, ns-883.awsdns-46.net, ns-1460.awsdns-54.org and ns-1760.awsdns-28.co.uk.
There is at least partial name server overlap between atcoder.com and other domains — palaceresorts-dev.com, 207.97.88.in-addr.arpa, spagoa.com and two more among them.
The name servers ns-796.awsdns-35.net, ns-1454.awsdns-53.org and ns-1751.awsdns-26.co.uk are often found in combination with these name servers.
All four hostnames — ns-17.awsdns-02.com, ns-883.awsdns-46.net, ns-1460.awsdns-54.org and ns-1760.awsdns-28.co.uk — resolve to two IP numbers apiece: ns-17.awsdns-02.com to 205.251.192.17 and 2600:9000:5300:1100::1; ns-883.awsdns-46.net to 205.251.195.115 and 2600:9000:5303:7300::1; ns-1460.awsdns-54.org to 205.251.197.180 and 2600:9000:5305:b400::1; ns-1760.awsdns-28.co.uk to 205.251.198.224 and 2600:9000:5306:e000::1.