sgk-u.net - robtex.com
sgk-u.net
| DNSSEC | ⚠️ Not signed | ||||||
| A | 202.223.208.1🇯🇵 SINET-AS202.223.128.0/17 SINET CIDR Block | ||||||
| PTR | dns.sgk.ac.jp | ||||||
| NS | dns2.sgk.ac.jp ⭐ | ||||||
| A | 202.223.208.2🇯🇵 SINET-AS202.223.128.0/17 SINET CIDR Block | ||||||
| PTR | dns2.sgk.ac.jp | ||||||
| NS | dns.sgk.ac.jp | ||||||
| A | 202.223.208.1🇯🇵 SINET-AS202.223.128.0/17 SINET CIDR Block | ||||||
| PTR | dns.sgk.ac.jp | ||||||
| MX | gw.sgk.ac.jp ⭐ | ||||||
| A | 202.223.208.7🇯🇵 SINET-AS202.223.128.0/17 SINET CIDR Block | ||||||
| PTR | gw.sgk.ac.jp | ||||||
| TXT | v=spf1 ip4:202.223.208.7 ip4:202.223.208.1 ~all | ||||||
| SOA | dns.sgk.ac.jppostmaster@mail.sgk.ac.jp 2026-04-01 #2 | ||||||
net
| 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=1777235951 | ||||||
Same first word
sgk-u.net |
Similar names
DNS History
4 records (4 active, 0 former)
●MXgw.sgk.ac.jp2017-01-03 → 2026-04-26 · 4 obs
● 2026-04-04 14:45:02
○ 2026-04-19 11:05:06
● 2026-04-26 21:02:58
●A202.223.208.12017-01-03 → 2026-04-26 · 4 obs
● 2026-04-04 14:45:02
○ 2026-04-19 11:05:06
● 2026-04-26 21:02:58
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| net | m.gtld-servers.net, k.gtld-servers.net, b.gtld-servers.net, f.gtld-servers.net... | - |
| sgk-u.net | dns.sgk.ac.jp, dns2.sgk.ac.jp | - |
✅ Authoritative Response
Server:202.223.208.1
NS records: dns.sgk.ac.jp, dns2.sgk.ac.jp
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for sgk-u.net (unsigned zone)
⏱️ Timing
Total: 1188ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 202.223.208.1 |
| NS | 2 | dns.sgk.ac.jp, dns2.sgk.ac.jp |
| MX | 1 | gw.sgk.ac.jp (pri: 10) |
| TXT | 1 | v=spf1 ip4:202.223.208.7 ip4:202.223.208 |
| SOA | 1 | dns.sgk.ac.jp postmaster.mail.sgk.ac.jp |
Analysis
IP Addresses
sgk-u.net resolves to one IP number: 202.223.208.1.
Other host names, for instance dns.sgk.ac.jp, shigakkan.jp and sgk.ac.jp share IP numbers with sgk-u.net.
Name Servers
sgk-u.net's delegation uses two name servers: dns2.sgk.ac.jp and dns.sgk.ac.jp.
sgk-u.net uses the same name server configuration as other domains, for example sgk.ac.jp, 208.223.202.in-addr.arpa and shigakkan.jp.
Host names with a single IP address: dns2.sgk.ac.jp points to 202.223.208.2; dns.sgk.ac.jp points to 202.223.208.1.
Mail Servers
A single mail server handles sgk-u.net, gw.sgk.ac.jp.
sgk-u.net uses the same mail server setup as other domains such as sgk.ac.jp, shigakkan.jp and stu.sgk.ac.jp.
Host name gw.sgk.ac.jp resolves to a single IP: 202.223.208.7.