21.tel - robtex.com
21.tel
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| A | 213.123.60.213🇬🇧 BT-UK-AS213.120.0.0/14 BT Public Internet Service | ||||||
| NS | ns2.bb-online.net ⭐ | ||||||
| A | 81.30.104.2🇩🇪 bbonline81.30.104.0/24 | ||||||
| NS | ns1.bb-online.net | ||||||
| A | 185.206.123.1🇬🇧 bbonline185.206.123.0/24 | ||||||
| NS | ns2.bb-online.org | ||||||
| A | 81.30.104.2🇩🇪 bbonline81.30.104.0/24 | ||||||
| NS | ns3.bb-online.info | ||||||
| A | 46.253.129.1🇬🇧 bbonline46.253.129.0/24 | ||||||
| NS | ns4.bb-online.biz | ||||||
| A | 91.238.194.4🇺🇦 bbonline91.238.194.0/24 | ||||||
| MX | mail1.bb-online.co.uk ⭐ | ||||||
| A | 136.244.76.63🇬🇧 AS-VULTR136.244.64.0/20 Vultr Assigned Prefix | ||||||
| PTR | mail1.bb-online.co.uk | ||||||
| MX | mail2.bb-online.co.uk(20) | ||||||
| A | 45.77.226.139🇬🇧 AS-VULTR45.77.224.0/21 Vultr Assigned Prefix | ||||||
| PTR | mail2.bb-online.co.uk | ||||||
| MX | mail4.bb-online.co.uk(30) | ||||||
| A | 108.61.173.17🇬🇧 AS-VULTR108.61.172.0/22 Vultr Assigned Prefix | ||||||
| PTR | mail4.bb-online.co.uk | ||||||
| SOA | ns2.bb-online.netpostmaster@21.tel 2026-06-26 #1 | ||||||
tel
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | anycast9.irondns.net ⭐ | ||||||
| NS | anycast10.irondns.net | ||||||
| NS | anycast23.irondns.net | ||||||
| NS | anycast24.irondns.net | ||||||
| SOA | anycast9.irondns.netdnsmaster@irondns.net serial=2606290613 | ||||||
Same first word
Similar names
DNS History
16 records (9 active, 7 former)
○NSa0.cth.dns.nic.tel2015-08-16 → 2016-12-27 · 4 obs
● 2016-12-27 19:32:40
○ 2026-06-15 13:05:08
○ 2026-06-29 06:29:00
○NSd0.cth.dns.nic.tel2015-08-16 → 2016-12-27 · 4 obs
● 2016-12-27 19:32:40
○ 2026-06-15 13:05:08
○ 2026-06-29 06:29:00
○NSn0.cth.dns.nic.tel2015-08-16 → 2016-12-27 · 4 obs
● 2016-12-27 19:32:40
○ 2026-06-15 13:05:08
○ 2026-06-29 06:29:00
●NSns1.bb-online.net2026-06-15 → 2026-06-29 · 3 obs
● 2026-06-15 13:05:08
● 2026-06-29 06:29:00
●NSns2.bb-online.net2026-06-15 → 2026-06-29 · 3 obs
● 2026-06-15 13:05:08
● 2026-06-29 06:29:00
●NSns2.bb-online.org2026-06-15 → 2026-06-29 · 3 obs
● 2026-06-15 13:05:08
● 2026-06-29 06:29:00
●NSns3.bb-online.info2026-06-15 → 2026-06-29 · 3 obs
● 2026-06-15 13:05:08
● 2026-06-29 06:29:00
●NSns4.bb-online.biz2026-06-15 → 2026-06-29 · 3 obs
● 2026-06-15 13:05:08
● 2026-06-29 06:29:00
○NSs0.cth.dns.nic.tel2015-08-16 → 2016-12-27 · 4 obs
● 2016-12-27 19:32:40
○ 2026-06-15 13:05:08
○ 2026-06-29 06:29:00
○NSt0.cth.dns.nic.tel2015-08-16 → 2016-12-27 · 4 obs
● 2016-12-27 19:32:40
○ 2026-06-15 13:05:08
○ 2026-06-29 06:29:00
●MXmail1.bb-online.co.uk2015-08-16 → 2026-06-29 · 2 obs
● 2026-06-29 06:29:00
●MXmail2.bb-online.co.uk2015-08-16 → 2026-06-29 · 2 obs
● 2026-06-29 06:29:00
○MXmail3.bb-online.co.uk2015-08-16 → 2016-12-27 · 4 obs
● 2016-12-27 19:32:40
○ 2026-06-15 13:05:08
○ 2026-06-29 06:29:00
●MXmail4.bb-online.co.uk2026-06-15 → 2026-06-29 · 3 obs
● 2026-06-15 13:05:08
● 2026-06-29 06:29:00
○A194.77.54.22015-08-16 → 2016-12-27 · 4 obs
● 2016-12-27 19:32:40
○ 2026-06-15 13:05:08
○ 2026-06-29 06:29:00
●A213.123.60.2132026-06-15 → 2026-06-29 · 3 obs
● 2026-06-15 13:05:08
● 2026-06-29 06:29:00
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| tel | anycast9.irondns.net, anycast10.irondns.net, anycast23.irondns.net, anycast24.irondns.net | 8 records |
| 21.tel | ns1.bb-online.net, ns2.bb-online.org, ns4.bb-online.biz, ns3.bb-online.info | - |
✅ Authoritative Response
Server:185.206.123.1
NS records: ns1.bb-online.net, ns2.bb-online.org, ns4.bb-online.biz, ns3.bb-online.info
🔒 DNSSEC Status
🔐 Secure (DNSSEC validated)
Chain of trust verified from root to domain
⏱️ Timing
Total: 712ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 213.123.60.213 |
| NS | 4 | ns3.bb-online.info, ns1.bb-online.net... |
| MX | 3 | mail2.bb-online.co.uk (pri: 20), mail4.bb-online.co.uk (pri: 30)... |
| SOA | 1 | ns2.bb-online.net postmaster.21.tel |
📌 Glue Records Collected
Total: 8
Out-of-bailiwick: 8 (anycast9.irondns.net, anycast9.irondns.net, anycast10.irondns.net...)
Analysis
IP Addresses
21.tel resolves to one IP address: 213.123.60.213.
playtechmobile.com, sports.motivation.org.uk, cts-ltd.co.uk and two other host names share IP numbers with 21.tel.
Name Servers
21.tel has five name servers, which are ns4.bb-online.biz, ns3.bb-online.info, ns1.bb-online.net and two others.
There is at least partial name server overlap between 21.tel and other domains — mdcelectrical.com, humansynergistics.de.com, voyage2100.com and two more among them.
These name servers tend to appear in combination with the name servers ns2.bb-online.org, ns2.bb-online.net, brain.bb-online.co.uk and ns3.bb-online.uk.
Hosts with just one IP address:
ns4.bb-online.biz resolves to the IP address 91.238.194.4.
ns3.bb-online.info resolves to the IP address 46.253.129.1.
ns1.bb-online.net resolves to the IP address 185.206.123.1.
ns2.bb-online.net resolves to the IP address 81.30.104.2.
ns2.bb-online.org resolves to the IP address 81.30.104.2.
ns2.bb-online.net and ns2.bb-online.org each have 81.30.104.2 IP addresses.
Mail Servers
Incoming mail for 21.tel is delivered via three mail servers: mail1.bb-online.co.uk, mail2.bb-online.co.uk and mail4.bb-online.co.uk.
21.tel has at least partial mail server overlap with other domains such as iloveboba.co.uk, merries.es, reyl.it and two more.
This set of mail servers commonly appears together with the mail servers mail3.bb-online.co.uk.
mail1.bb-online.co.uk has IP address 136.244.76.63, mail2.bb-online.co.uk has IP address 45.77.226.139 and mail4.bb-online.co.uk has IP address 108.61.173.17 — one address each.