algebra21.com - robtex.com
algebra21.com
| DNSSEC | ⚠️ Not signed | ||||||
| A | 213.221.108.182🇩🇪 CLARANET-AS213.221.64.0/18 CLARANET-DE 8196:1 8196:100 | ||||||
| PTR | leonardo.webstrategy.de | ||||||
| NS | dns3.webstrategy.de ⭐ | ||||||
| A | 2001:67c:1bc::13🇦🇹 RCODEZERO-ANYCAST-SEC1-TLD2001:67c:1bc::/48 IPCom-NET Anycast | ||||||
| PTR | pns01.kyberio-dns.com | ||||||
| A | 192.174.68.13🇦🇹 RCODEZERO-ANYCAST-SEC1-TLD192.174.68.0/24 NICat-anycast-net | ||||||
| PTR | pns01.kyberio-dns.com | ||||||
| NS | dns4.webstrategy.de | ||||||
| A | 2001:67c:10b8::13🇨🇭 RCODEZERO-ANYCAST-SEC22001:67c:10b8::/48 IPCOM-anycast-net | ||||||
| PTR | pns02.kyberio-dns.de | ||||||
| A | 176.97.158.13🇦🇹 RCODEZERO-ANYCAST-SEC2176.97.158.0/24 NICat-anycast-net | ||||||
| PTR | pns02.kyberio-dns.de | ||||||
| MX | mail.algebra21.com ⭐ | ||||||
| A | 213.221.108.182🇩🇪 CLARANET-AS213.221.64.0/18 CLARANET-DE 8196:1 8196:100 | ||||||
| PTR | leonardo.webstrategy.de | ||||||
| SOA | dns3.webstrategy.dehostmaster@webstrategy.de 2024-12-03 #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=1774733677 | ||||||
Subdomains
mail.algebra21.com |
Same first word
algebra21.net |
algebra21.com |
algebra21.de |
DNS History
4 records (4 active, 0 former)
●NSdns3.webstrategy.de2015-08-18 → 2026-03-28 · 2 obs
● 2026-03-28 21:36:44
●NSdns4.webstrategy.de2015-08-18 → 2026-03-28 · 2 obs
● 2026-03-28 21:36:44
●MXmail.algebra21.com2015-08-18 → 2026-03-28 · 2 obs
● 2026-03-28 21:36:44
●A213.221.108.1822015-08-18 → 2026-03-28 · 2 obs
● 2026-03-28 21:36:44
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | a.gtld-servers.net, f.gtld-servers.net, k.gtld-servers.net, b.gtld-servers.net... | - |
| algebra21.com | dns3.webstrategy.de, dns4.webstrategy.de | - |
✅ Authoritative Response
Server:176.97.158.13
NS records: dns3.webstrategy.de, dns4.webstrategy.de
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for algebra21.com (unsigned zone)
⏱️ Timing
Total: 406ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 213.221.108.182 |
| NS | 2 | dns3.webstrategy.de, dns4.webstrategy.de |
| MX | 1 | mail.algebra21.com (pri: 10) |
| SOA | 1 | dns3.webstrategy.de hostmaster.webstrate |
Analysis
Hierarchy
algebra21.com is the parent of mail.algebra21.com.
IP Addresses
algebra21.com resolves to a single IP address: 213.221.108.182.
Other host names including mail.besseres-hoeren.de, mail.logbuchkreuzfahrt.de, mail.methodso(0x666170)pliedalgebra.com, mail.ilittleblackbook.com and algebraic-methods.com share IP numbers with algebra21.com.
Name Servers
algebra21.com's delegation uses two name servers, dns3.webstrategy.de and dns4.webstrategy.de.
algebra21.com shares the same name server setup as other domains, for example nagel.de, web-mining.net, b2b4u.org, plastischechirurgiebadsoden.de and sozialberatung-badsoden.de.
algebra21.com at least partially shares name servers with other domains, including go-bn.de, gynaekologie-usingen.de, kulturberater.de, niklas-nagel.de and isabelle-nagel.de.
Host names with two IPs:
dns3.webstrategy.de points to: 2001:67c:1bc::13 and 192.174.68.13
dns4.webstrategy.de points to: 2001:67c:10b8::13 and 176.97.158.13
Mail Servers
algebra21.com is handled by a single mail server, mail.algebra21.com.
mail.algebra21.com points to a single IP: 213.221.108.182.