code4j.org - robtex.com
code4j.org
| DNSSEC | ⚠️ Not signed | ||||||
| A | 3.64.55.35🇩🇪 Amazon3.64.0.0/12 EC2 FRA Prefix | ||||||
| PTR | ec2-3-64-55-35.eu-central-1.compute.amazonaws.com | ||||||
| NS | ns-1581.awsdns-05.co.uk ⭐ | ||||||
| A | 2600:9000:5306:2d00::1🇺🇸 Amazon2600:9000:5306::/48 - CloudFront | ||||||
| PTR | ns-1581.awsdns-05.co.uk | ||||||
| A | 205.251.198.45🇺🇸 Amazon205.251.198.0/24 prefix | ||||||
| PTR | ns-1581.awsdns-05.co.uk | ||||||
| NS | ns-1362.awsdns-42.org | ||||||
| A | 2600:9000:5305:5200::1🇺🇸 Amazon2600:9000:5305::/48 - CloudFront | ||||||
| PTR | ns-1362.awsdns-42.org | ||||||
| A | 205.251.197.82🇺🇸 Amazon205.251.197.0/24 prefix | ||||||
| PTR | ns-1362.awsdns-42.org | ||||||
| NS | ns-299.awsdns-37.com | ||||||
| A | 2600:9000:5301:2b00::1🇺🇸 Amazon2600:9000:5301::/48 - CloudFront | ||||||
| PTR | ns-299.awsdns-37.com | ||||||
| A | 205.251.193.43🇺🇸 Amazon205.251.193.0/24 prefix | ||||||
| PTR | ns-299.awsdns-37.com | ||||||
| NS | ns-983.awsdns-58.net | ||||||
| A | 2600:9000:5303:d700::1🇺🇸 Amazon2600:9000:5303::/48 - CloudFront | ||||||
| PTR | ns-983.awsdns-58.net | ||||||
| A | 205.251.195.215🇺🇸 Amazon205.251.195.0/24 prefix | ||||||
| PTR | ns-983.awsdns-58.net | ||||||
| SOA | ns-1581.awsdns-05.co.ukawsdns-hostmaster@amazon.com serial=1 | ||||||
org
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a0.org.afilias-nst.info ⭐ ⚠️ Not in parent delegation | ||||||
| NS | a2.org.afilias-nst.info ⚠️ Not in parent delegation | ||||||
| NS | b0.org.afilias-nst.org | ||||||
| NS | b2.org.afilias-nst.org | ||||||
| NS | c0.org.afilias-nst.info ⚠️ Not in parent delegation | ||||||
| NS | d0.org.afilias-nst.org | ||||||
| SOA | a0.org.afilias-nst.infohostmaster@donuts.email serial=1774500411 | ||||||
Same first word
DNS History
10 records (5 active, 5 former)
●NSns-1362.awsdns-42.org2026-02-18 → 2026-03-26 · 3 obs
● 2026-02-18 12:30:52
● 2026-03-26 05:03:16
●NSns-1581.awsdns-05.co.uk2026-02-18 → 2026-03-26 · 3 obs
● 2026-02-18 12:30:52
● 2026-03-26 05:03:16
●NSns-299.awsdns-37.com2026-02-18 → 2026-03-26 · 3 obs
● 2026-02-18 12:30:52
● 2026-03-26 05:03:16
●NSns-983.awsdns-58.net2026-02-18 → 2026-03-26 · 3 obs
● 2026-02-18 12:30:52
● 2026-03-26 05:03:16
○NSns1.ogicom.pl2015-10-17 → 2015-12-10 · 4 obs
● 2015-12-10 15:00:42
○ 2016-12-16 11:22:30
○ 2026-03-26 05:03:16
○NSns2.ogicom.pl2015-10-17 → 2015-12-10 · 4 obs
● 2015-12-10 15:00:42
○ 2016-12-16 11:22:30
○ 2026-03-26 05:03:16
○NSns3.ogicom.pl2015-10-17 → 2015-12-10 · 4 obs
● 2015-12-10 15:00:42
○ 2016-12-16 11:22:30
○ 2026-03-26 05:03:16
○MXmx.code4j.org2015-10-17 → 2015-12-10 · 4 obs
● 2015-12-10 15:00:42
○ 2016-12-16 11:22:30
○ 2026-03-26 05:03:16
●A3.64.55.352026-02-18 → 2026-03-26 · 3 obs
● 2026-02-18 12:30:52
● 2026-03-26 05:03:16
○A93.157.100.532015-10-17 → 2015-12-10 · 4 obs
● 2015-12-10 15:00:42
○ 2016-12-16 11:22:30
○ 2026-03-26 05:03:16
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| org | b0.org.afilias-nst.org, b2.org.afilias-nst.org, d0.org.afilias-nst.org | - |
| code4j.org | ns-1581.awsdns-05.co.uk, ns-299.awsdns-37.com, ns-983.awsdns-58.net, ns-1362.awsdns-42.org | 1 record |
✅ Authoritative Response
Server:205.251.197.82
NS records: ns-1581.awsdns-05.co.uk, ns-299.awsdns-37.com, ns-983.awsdns-58.net, ns-1362.awsdns-42.org
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for code4j.org (unsigned zone)
⏱️ Timing
Total: 389ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 3.64.55.35 |
| NS | 4 | ns-1362.awsdns-42.org, ns-1581.awsdns-05.co.uk... |
| SOA | 1 | ns-1581.awsdns-05.co.uk awsdns-hostmaste |
📌 Glue Records Collected
Total: 1
Out-of-bailiwick: 1 (ns-1362.awsdns-42.org)
Analysis
IP Addresses
code4j.org resolves to a single IP: 3.64.55.35.
Name Servers
code4j.org is delegated to four name servers: ns-299.awsdns-37.com, ns-983.awsdns-58.net, ns-1362.awsdns-42.org and ns-1581.awsdns-05.co.uk.
code4j.org shares some name servers with other domains, for example cloud.aofund.org, abt.aquasites.net, utilitywarehouseopportunity.info, williamselectric.com and jacketjackettt.s3.us-east-2.amazonaws.com.
These name servers are commonly used with the name servers ns-1628.awsdns-11.co.uk.
Host names with two IP numbers
Two IPs per host:
ns-299.awsdns-37.com points to 2600:9000:5301:2b00::1 and 205.251.193.43
ns-983.awsdns-58.net points to 2600:9000:5303:d700::1 and 205.251.195.215
ns-1362.awsdns-42.org points to 2600:9000:5305:5200::1 and 205.251.197.82
ns-1581.awsdns-05.co.uk points to 2600:9000:5306:2d00::1 and 205.251.198.45