atcoder.co.jp - robtex.com
atcoder.co.jp
| DNSSEC | ⚠️ Not signed | ||||||
| A | 3.113.224.135🇯🇵 Amazon3.112.0.0/14 EC2 NRT prefix | ||||||
| PTR | ec2-3-113-224-135.ap-northeast-1.compute.amazonaws.com | ||||||
| A | 43.207.252.214🇯🇵 Amazon43.206.0.0/15 EC2 NRT Prefix | ||||||
| NS | ns-1466.awsdns-55.org ⭐ | ||||||
| A | 2600:9000:5305:ba00::1🇺🇸 Amazon2600:9000:5305::/48 - CloudFront | ||||||
| PTR | ns-1466.awsdns-55.org | ||||||
| A | 205.251.197.186🇺🇸 Amazon205.251.197.0/24 prefix | ||||||
| PTR | ns-1466.awsdns-55.org | ||||||
| NS | ns-1658.awsdns-15.co.uk | ||||||
| A | 2600:9000:5306:7a00::1🇺🇸 Amazon2600:9000:5306::/48 - CloudFront | ||||||
| PTR | ns-1658.awsdns-15.co.uk | ||||||
| A | 205.251.198.122🇺🇸 Amazon205.251.198.0/24 prefix | ||||||
| PTR | ns-1658.awsdns-15.co.uk | ||||||
| NS | ns-429.awsdns-53.com | ||||||
| A | 2600:9000:5301:ad00::1🇺🇸 Amazon2600:9000:5301::/48 - CloudFront | ||||||
| PTR | ns-429.awsdns-53.com | ||||||
| A | 205.251.193.173🇺🇸 Amazon205.251.193.0/24 prefix | ||||||
| PTR | ns-429.awsdns-53.com | ||||||
| NS | ns-858.awsdns-43.net | ||||||
| A | 2600:9000:5303:5a00::1🇺🇸 Amazon2600:9000:5303::/48 - CloudFront | ||||||
| PTR | ns-858.awsdns-43.net | ||||||
| A | 205.251.195.90🇺🇸 Amazon205.251.195.0/24 prefix | ||||||
| PTR | ns-858.awsdns-43.net | ||||||
| SOA | ns-1466.awsdns-55.orgawsdns-hostmaster@amazon.com serial=1 | ||||||
co.jp
| DNSSEC | ⚠️ Not signed | ||||||
| TXT | co.jp. | ||||||
Same first word
Similar names
DNS History
17 records (6 active, 11 former)
○NS01.dnsv.jp2015-05-14 → 2016-07-20 · 4 obs
● 2016-07-20 23:43:04
○ 2017-03-19 10:19:04
○ 2026-04-11 18:53:16
○NS02.dnsv.jp2015-05-14 → 2016-07-20 · 4 obs
● 2016-07-20 23:43:04
○ 2017-03-19 10:19:04
○ 2026-04-11 18:53:16
○NS03.dnsv.jp2015-05-14 → 2016-07-20 · 4 obs
● 2016-07-20 23:43:04
○ 2017-03-19 10:19:04
○ 2026-04-11 18:53:16
○NS04.dnsv.jp2015-05-14 → 2016-07-20 · 4 obs
● 2016-07-20 23:43:04
○ 2017-03-19 10:19:04
○ 2026-04-11 18:53:16
●NSns-1466.awsdns-55.org2017-03-19 → 2026-04-11 · 3 obs
● 2017-03-19 10:19:04
● 2026-04-11 18:53:16
●NSns-1658.awsdns-15.co.uk2017-03-19 → 2026-04-11 · 3 obs
● 2017-03-19 10:19:04
● 2026-04-11 18:53:16
●NSns-429.awsdns-53.com2017-03-19 → 2026-04-11 · 3 obs
● 2017-03-19 10:19:04
● 2026-04-11 18:53:16
●NSns-858.awsdns-43.net2017-03-19 → 2026-04-11 · 3 obs
● 2017-03-19 10:19:04
● 2026-04-11 18:53:16
○A13.115.44.1962026-03-12 → 2026-03-12 · 4 obs
● 2026-03-12 05:03:30
○ 2026-04-04 08:33:38
○ 2026-04-11 18:53:16
○A13.192.249.582026-03-12 → 2026-03-12 · 4 obs
● 2026-03-12 05:03:30
○ 2026-04-04 08:33:38
○ 2026-04-11 18:53:16
○A18.180.239.1252026-02-20 → 2026-02-20 · 4 obs
● 2026-02-20 06:33:36
○ 2026-03-12 05:03:30
○ 2026-04-11 18:53:16
●A3.113.224.1352026-04-04 → 2026-04-11 · 3 obs
● 2026-04-04 08:33:38
● 2026-04-11 18:53:16
●A43.207.252.2142026-04-04 → 2026-04-11 · 3 obs
● 2026-04-04 08:33:38
● 2026-04-11 18:53:16
○A52.192.232.2332026-02-20 → 2026-04-11 · 2 obs
○ 2026-04-11 18:53:16
○A52.197.53.702026-02-20 → 2026-02-20 · 4 obs
● 2026-02-20 06:33:36
○ 2026-03-12 05:03:30
○ 2026-04-11 18:53:16
○A52.198.82.82026-02-20 → 2026-04-11 · 2 obs
○ 2026-04-11 18:53:16
○A54.64.36.2352015-05-14 → 2020-03-10 · 4 obs
● 2020-03-10 12:33:06
○ 2026-02-20 06:33:36
○ 2026-04-11 18:53:16
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| jp | d.dns.jp, a.dns.jp, f.dns.jp, h.dns.jp... | - |
| atcoder.co.jp | ns-858.awsdns-43.net, ns-429.awsdns-53.com, ns-1658.awsdns-15.co.uk, ns-1466.awsdns-55.org | - |
✅ Authoritative Response
Server:205.251.197.186
NS records: ns-858.awsdns-43.net, ns-429.awsdns-53.com, ns-1658.awsdns-15.co.uk, ns-1466.awsdns-55.org
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for atcoder.co.jp (unsigned zone)
⏱️ Timing
Total: 511ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 2 | 3.113.224.135, 43.207.252.214 |
| NS | 4 | ns-1466.awsdns-55.org, ns-1658.awsdns-15.co.uk... |
| SOA | 1 | ns-1466.awsdns-55.org awsdns-hostmaster. |
Analysis
IP Addresses
atcoder.co.jp resolves to two IP numbers: 3.113.224.135 and 43.207.252.214.
Name Servers
atcoder.co.jp's delegation is handled by four name servers: ns-429.awsdns-53.com, ns-858.awsdns-43.net, ns-1466.awsdns-55.org and ns-1658.awsdns-15.co.uk.
atcoder.co.jp partially shares name servers with other domains; examples include best-fit.app, serv24.com, control-systems.siemens.cloud, hostailegames.us and bondish-delivery.net.
These name servers are commonly used with ns-55.awsdns-06.com, ns-521.awsdns-01.net and ns-1129.awsdns-13.org.
Host names with two IPs:
ns-429.awsdns-53.com points to 2600:9000:5301:ad00::1 and 205.251.193.173
ns-858.awsdns-43.net points to 2600:9000:5303:5a00::1 and 205.251.195.90
ns-1466.awsdns-55.org points to 2600:9000:5305:ba00::1 and 205.251.197.186
ns-1658.awsdns-15.co.uk points to 2600:9000:5306:7a00::1 and 205.251.198.122