sizetheory.com - robtex.com
sizetheory.com
| DNSSEC | ⚠️ Not signed | ||||||
| A | 212.23.5.205🇬🇧 ZEN-AS212.23.0.0/19 Zen Internet Ltd | ||||||
| PTR | cp01.hosting.zen.net.uk | ||||||
| NS | ns0.zen.co.uk ⭐ | ||||||
| A | 2a02:8010:7:1::53🇬🇧 ZEN-AS2a02:8010::/29 Zen Internet Ltd | ||||||
| PTR | ns0.zen.co.uk | ||||||
| A | 212.23.8.1🇬🇧 ZEN-AS212.23.0.0/19 Zen Internet Ltd | ||||||
| PTR | ns0.zen.co.uk | ||||||
| NS | ns1.zen.co.uk | ||||||
| A | 2a02:8010:2:8::53🇬🇧 ZEN-AS2a02:8010::/29 Zen Internet Ltd | ||||||
| PTR | ns1.zen.co.uk | ||||||
| A | 212.23.3.1🇬🇧 ZEN-AS212.23.0.0/19 Zen Internet Ltd | ||||||
| PTR | ns1.zen.co.uk | ||||||
| MX | mailcluster.zen.co.uk ⭐ | ||||||
| A | 212.23.3.121🇬🇧 ZEN-AS212.23.0.0/19 Zen Internet Ltd | ||||||
| PTR | bastion02.mail.zen.net.uk | ||||||
| A | 212.23.6.67🇬🇧 ZEN-AS212.23.0.0/19 Zen Internet Ltd | ||||||
| PTR | bastion04.mail.zen.net.uk | ||||||
| TXT | v=spf1 +mx +a +ip4:88.98.24.75 ~all | ||||||
| TXT | google-site-verification=vSRr5lIhhdNa2sQPC6FJayeDVLiTE5OdSTE12fvaDbQ | ||||||
| SOA | ns0.zen.co.uknetman@zen.co.uk 2023-03-24 #2 | ||||||
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=1776285002 | ||||||
Same first word
sizetheory.com |
DNS History
13 records (4 active, 9 former)
○NSdns1.name-services.com2015-06-08 → 2018-09-13 · 4 obs
● 2018-09-13 02:17:14
○ 2026-04-13 16:25:44
○ 2026-04-15 20:58:02
○NSdns2.name-services.com2015-06-08 → 2018-09-13 · 4 obs
● 2018-09-13 02:17:14
○ 2026-04-13 16:25:44
○ 2026-04-15 20:58:02
○NSdns3.name-services.com2015-06-08 → 2018-09-13 · 4 obs
● 2018-09-13 02:17:14
○ 2026-04-13 16:25:44
○ 2026-04-15 20:58:02
○NSdns4.name-services.com2015-06-08 → 2018-09-13 · 4 obs
● 2018-09-13 02:17:14
○ 2026-04-13 16:25:44
○ 2026-04-15 20:58:02
○NSdns5.name-services.com2015-06-08 → 2018-09-13 · 4 obs
● 2018-09-13 02:17:14
○ 2026-04-13 16:25:44
○ 2026-04-15 20:58:02
●NSns0.zen.co.uk2026-04-13 → 2026-04-15 · 3 obs
● 2026-04-13 16:25:44
● 2026-04-15 20:58:02
●NSns1.zen.co.uk2026-04-13 → 2026-04-15 · 3 obs
● 2026-04-13 16:25:44
● 2026-04-15 20:58:02
●MXmailcluster.zen.co.uk2026-04-13 → 2026-04-15 · 3 obs
● 2026-04-13 16:25:44
● 2026-04-15 20:58:02
○MXmx.mail2.name-services.com2015-10-25 → 2017-02-02 · 5 obs
● 2015-10-25 09:43:00
● 2017-02-02 13:49:20
○ 2018-09-13 02:17:14
○ 2026-04-15 20:58:02
○MXmx.sizetheory.com.cust.a.hostedemail.com2018-09-13 → 2018-09-13 · 4 obs
● 2018-09-13 02:17:14
○ 2026-04-13 16:25:44
○ 2026-04-15 20:58:02
○MXmxin.name-services.com2015-06-08 → 2015-06-08 · 3 obs
○ 2015-10-25 09:43:00
○ 2026-04-15 20:58:02
●A212.23.5.2052026-04-13 → 2026-04-15 · 3 obs
● 2026-04-13 16:25:44
● 2026-04-15 20:58:02
○A84.45.17.1442015-06-08 → 2018-09-13 · 4 obs
● 2018-09-13 02:17:14
○ 2026-04-13 16:25:44
○ 2026-04-15 20:58:02
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | l.gtld-servers.net, j.gtld-servers.net, h.gtld-servers.net, d.gtld-servers.net... | - |
| sizetheory.com | ns0.zen.co.uk, ns1.zen.co.uk | - |
✅ Authoritative Response
Server:212.23.3.1
NS records: ns0.zen.co.uk, ns1.zen.co.uk
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for sizetheory.com (unsigned zone)
⏱️ Timing
Total: 2815ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 212.23.5.205 |
| NS | 2 | ns1.zen.co.uk, ns0.zen.co.uk |
| MX | 1 | mailcluster.zen.co.uk (pri: 10) |
| TXT | 2 | google-site-verification=vSRr5lIhhdNa2sQ, v=spf1 +mx +a +ip4:88.98.24.75 ~all |
| SOA | 1 | ns0.zen.co.uk netman.zen.co.uk |
Analysis
IP Addresses
sizetheory.com maps to IP address 212.23.5.205.
Other host names, for instance halpernandco.com, tcc.uk, musicwebinternational.co.uk, caistealcourt.com and imgliddon.net share IP numbers with sizetheory.com.
Name Servers
Two name servers ns0.zen.co.uk and ns1.zen.co.uk are delegated to sizetheory.com.
sizetheory.com uses the same name server configuration as other domains, such as longdencook.com, 3peaks.org.uk, 67.155.217.in-addr.arpa, 168.155.217.in-addr.arpa and vanguard-textiles.com.
sizetheory.com shares name servers with other domains at least partially, for instance hlcp.co.uk and zeneu.com.
Host names with two IPs:
ns0.zen.co.uk points to 2a02:8010:7:1::53 and 212.23.8.1.
ns1.zen.co.uk points to 2a02:8010:2:8::53 and 212.23.3.1.
Mail Servers
sizetheory.com is handled by a single mail server, mailcluster.zen.co.uk.
sizetheory.com shares the same mail server setup as other domains, including bhangra.co.uk, charingbowlsclub.co.uk, ciosif.co.uk, questleadershipdevelopment.com and mole-traps.co.uk.
sizetheory.com shares mail servers with other domains at least in part, for instance sogoplay.com, hallmark.co.uk, sccrc.co.uk, nuls.org.uk and zen-inter.net.
Host name mailcluster.zen.co.uk points to IPs 212.23.3.121 and 212.23.6.67.