81.21.184.0/21

AS39244 · Teqnobase

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Summary

Country	Netherlands
Domain	schoologica.nl
ASN	AS39244
Registry	RIPE
ID	NL-TEQNOBASE-20060117

WHOIS Details

inetnum:        81.21.176.0 - 81.21.191.255
netname:        NL-TEQNOBASE-20060117
country:        NL
org:            ORG-TB13-RIPE
admin-c:        AT3947-RIPE
tech-c:         EL2943-RIPE
status:         ALLOCATED PA
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         MNT-TEQNOBASE
mnt-lower:      TeqnoBase-MNT
mnt-lower:      MNT-TEQNOBASE
mnt-routes:     TeqnoBase-MNT
notify:         allard@schoolmaster.nl
created:        2006-01-17T16:57:29Z
last-modified:  2024-04-03T07:43:59Z
source:         RIPE
abuse-email:    abuse@schoologica.nl
abuse-c:        AR16287-RIPE
abuse-org:      ORG-TB13-RIPE

organisation:   ORG-TB13-RIPE
org-name:       Sanoma Schoologica B.V.
country:        NL
org-type:       LIR
address:        Postbus 1277
address:        8900CG
address:        Leeuwarden
address:        NETHERLANDS
phone:          +31 58 2987171
fax-no:         +31 58 2987172
e-mail:         noc.digital@iddinkgroup.nl
abuse-c:        AR16287-RIPE
mnt-ref:        RIPE-NCC-HM-MNT
mnt-ref:        MNT-TeqnoBase
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         MNT-TEQNOBASE
admin-c:        EL2943-RIPE
admin-c:        AB16157-RIPE
admin-c:        AT3947-RIPE
created:        2005-12-28T11:02:15Z
last-modified:  2025-06-19T08:35:06Z
source:         RIPE
abuse-email:    abuse@schoologica.nl
abuse-c:        AR16287-RIPE
abuse-org:      undefined

person:         Allard Toornstra
address:        Wiardaplantage 17
address:        8939 AA Leeuwarden
address:        The Netherlands
phone:          +31 (0) 58 298 71 71
fax-no:         +31 (0) 58 298 71 72
e-mail:         Allard.Toornstra@iddinkgroup.nl
mnt-by:         TeqnoBase-MNT
nic-hdl:        AT3947-RIPE
notify:         noc@schoolmaster.nl
created:        2006-01-03T12:16:11Z
last-modified:  2024-03-21T07:33:55Z
source:         RIPE

person:         Eric Limpens
address:        Wiardaplantage 17
address:        8939 AA Leeuwarden
address:        The Netherlands
phone:          +31 (0) 58 298 71 71
nic-hdl:        EL2943-RIPE
mnt-by:         TeqnoBase-MNT
created:        2011-10-19T13:26:19Z
last-modified:  2015-07-09T06:20:03Z
source:         RIPE

route:          81.21.176.0/20
descr:          Teqnobase block
origin:         AS39244
mnt-by:         TeqnoBase-MNT
created:        2006-01-23T09:52:10Z
last-modified:  2006-01-23T09:52:10Z
source:         RIPE

Nearby Ranges

BGP prefixes that overlap with 81.21.0.0/16

Range	ASN	Company	Num of IPs
81.21.144.0/20	AS62862	Rapid Fiber Internet, LLC	4,096
81.21.32.0/20	AS8544	Primetel PLC	4,096
81.21.112.0/20	AS44462	Stadtwerke Muerzzuschlag GmbH	4,096
81.21.240.0/20	AS1257	Tele2 Sverige AB	4,096
81.21.48.0/20	AS39228	Integrated Networks Co.	4,096
81.21.32.0/20	AS16229	Primetel PLC	4,096
81.21.16.0/20	AS30848	UNIDATA S.p.A.	4,096
81.21.136.0/21	AS28878	Signet B.V.	2,048
81.21.128.0/21	AS12505	Banco BPM S.P.A	2,048
81.21.228.0/22	AS213005	Invermae Solutions SL	1,024
81.21.232.0/22	AS203020	HostRoyale Technologies Pvt Ltd	1,024
81.21.103.0/24	AS31065	eGOV project_1	256
81.21.104.0/24	AS31065	eGOV project_2	256
81.21.105.0/24	AS31065	eGOV project_3	256
81.21.106.0/24	AS31065	National_Telecom_Regulatory_Authority_Egypt	256
81.21.107.0/24	AS31065	MCIT Network	256
81.21.108.0/24	AS31065	MCIT Network	256
81.21.109.0/24	AS31065	Ministry of Communications & IT network.	256
81.21.96.0/24	AS31065	National Telecom Regulatory Authority_2	256
81.21.97.0/24	AS31065	Ministry of Communications and Information Technology	256
81.21.99.0/24	AS31065	Egyptian Ministry of Communication and IT projects. Secondry DNS, AfriNIC whois db servers mirroring, others.	256
81.21.136.0/24	AS31586	Signet Son	256
81.21.48.0/24	AS39228	iNet Backbone Devices	256
81.21.49.0/24	AS39228	Dialup Pool 1 for iNET	256
81.21.50.0/24	AS39228	DSL Pool for iNET	256
81.21.51.0/24	AS39228	Dialup Pool 2 for iNET	256
81.21.179.0/24	AS39244	ST	256
81.21.2.0/24	AS5065	Bunny Communications LLC	256
81.21.8.0/24	AS50670	VTEL HOLDINGS LIMITED/JORDAN CO.	256
81.21.9.0/24	AS50670	VTEL HOLDINGS LIMITED/JORDAN CO.	256
81.21.1.0/24	AS834	VTEL HOLDINGS LIMITED/JORDAN CO.	256
81.21.3.0/24	AS834	VTEL HOLDINGS LIMITED/JORDAN CO.	256
81.21.4.0/24	AS834	VTEL HOLDINGS LIMITED/JORDAN CO.	256
81.21.7.0/24	AS834	VTEL HOLDINGS LIMITED/JORDAN CO.	256
81.21.38.0/24	AS8544	Primetel PLC	256
81.21.41.0/24	AS8544	Primetel PLC	256
81.21.46.0/24	AS8544	NetWay LTD	256
81.21.175.0/24	AS8685	DorukNet	256
81.21.207.0/24	AS8726	Noblesecurities network.	256
81.21.47.0/24	AS16229	NetWay LTD	256
81.21.206.0/24	AS200094	PHU MIROLAN Miroslaw Weclaw	256
81.21.224.0/24	AS209041	CoreIT AB	256
81.21.225.0/24	AS209041	CoreIT AB	256
81.21.226.0/24	AS209041	CoreIT AB	256
81.21.227.0/24	AS209041	CoreIT AB	256
81.21.0.0/24	AS29802	Private Customer	256
81.21.43.0/24	AS30916	NetWay LTD	256
81.21.45.0/24	AS30916	NetWay LTD	256
81.21.102.0/24	AS31065	Egypt Radio and Television Union	256

Hosted domains

There are 16 domain names hosted across 2 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
81.21.187.2	comeniusnet.nl	15
81.21.184.86	frenckencollege.com	1

Hosted domains API

Our Hosted Domains API, or Reverse IP API returns a full list of domains that are hosted on a single IP address.

Useful for Cybersecurity

Read more

Pingable IPs

15 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
81.21.186.13	AS39244 Teqnobase	`5.18ms` from Amsterdam, NL
81.21.187.20	AS39244 Teqnobase	`3.97ms` from Amsterdam, NL
81.21.185.16	AS39244 Teqnobase	`5.15ms` from Amsterdam, NL

Other Pingable IPs

Below is a random selection of 25 IPs that replied to an ICMP ping during our most recent internet scan.

IP Address	ASN	Details
3.215.179.165	AS14618 Amazon.com, Inc.	`0.77ms` from Ashburn, US
218.77.111.101	AS4134 CHINANET-BACKBONE	`1.91ms` from Changsha, CN
50.65.67.85	AS6327 Shaw Communications	`8.19ms` from Edmonton, CA
94.10.250.213	AS5607 Sky UK Limited	`3.34ms` from Erith, GB
63.179.9.21	AS16509 Amazon.com, Inc.	`0.16ms` from Frankfurt am Main, DE
59.56.242.165	AS4134 CHINANET-BACKBONE	`4.79ms` from Fuzhou, CN
35.189.74.69	AS396982 Google LLC	`0.11ms` from London, GB
90.202.0.165	AS5607 Sky UK Limited	`10.39ms` from London, GB
46.173.32.21	AS49120 Gorset Ltd.	`3.15ms` from Moscow, RU
112.20.74.21	AS56046 China Mobile communications corporation	`1.15ms` from Nanjing, CN
24.244.171.133	AS15146 Cable Bahamas	`1.47ms` from Nassau, BS
54.94.69.165	AS16509 Amazon.com, Inc.	`0.16ms` from Osasco, BR
72.210.61.149	AS22773 Cox Communications Inc.	`1.26ms` from Phoenix, US
76.27.39.5	AS7922 Comcast Cable Communications, LLC	`9.26ms` from Salt Lake City, US
115.68.6.53	AS38700 SMILESERV	`1.16ms` from Seoul, KR
222.104.78.213	AS4766 Korea Telecom	`6.01ms` from Seoul, KR
169.136.99.133	AS10122 NETSTAR (SG) PTE. LTD.	`0.25ms` from Singapore, SG
213.200.14.85	AS16010 Magticom Ltd.	`0.90ms` from Tbilisi, GE
147.235.219.101	AS6810 Bezeq- THE ISRAEL TELECOMMUNICATION CORP. LTD.	`0.23ms` from Tel Aviv, IL
126.147.58.21	AS17676 SoftBank Corp.	`2.77ms` from Tokyo, JP
34.229.57.197	AS14618 Amazon.com, Inc.	`0.51ms` from Ashburn, US
181.101.10.85	AS7303 Telecom Argentina S.A.	`9.88ms` from Buenos Aires, AR
97.147.133.85	AS6167 Verizon Business	`13.21ms` from Chicago, US
154.118.130.85	AS30985 Orange Mali SA	`19.92ms` from Dakar, SN
146.169.34.53	AS786 Jisc Services Limited	`1.26ms` from London, GB

Traceroute

Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this range. Learn more.

traceroute -a -n -q1 -f5 -m10 81.21.188.181

traceroute to 81.21.188.181 (81.21.188.181): 10 hops max, 52 byte packets

5 [AS32787] 2.21.116.107 1.163 ms

6 [AS8455] 95.142.97.219 81.642 ms

7 [AS39244] 81.21.187.12 79.904 ms

8 *

9 *

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Measurement taken from

IPinfo ProbeNet in New York City, US

On March 13th 2026

What are IP address ranges?

IP address ranges, or netblocks, are groups of related IP addresses. They are usually represented as a base IP address, followed by a slash, and then a netmask which represents how many IP addresses are contained within the netblock. This format is known as CIDR. You'll also sometimes see netblocks given as a start ip address, and an end ip address, or an ip address range.

Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.

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