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
81.21.32.0/20	AS16229	Primetel PLC	4,096
81.21.16.0/20	AS30848	UNIDATA S.p.A.	4,096
81.21.48.0/20	AS39228	Integrated Networks Co.	4,096
81.21.112.0/20	AS44462	Stadtwerke Muerzzuschlag GmbH	4,096
81.21.144.0/20	AS62862	Rapid Fiber Internet, LLC	4,096
81.21.240.0/20	AS1257	Tele2 Sverige AB	4,096
81.21.32.0/20	AS8544	Primetel PLC	4,096
81.21.128.0/21	AS12505	Banco BPM S.P.A	2,048
81.21.136.0/21	AS28878	Signet B.V.	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
81.21.102.0/24	AS31065	Egypt Radio and Television Union	256
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
81.21.38.0/24	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
81.21.47.0/24	AS16229	NetWay LTD	256
81.21.206.0/24	AS200094	PHU MIROLAN Miroslaw Weclaw	256
81.21.4.0/24	AS203728	BAHU LTD	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
81.21.3.0/24	AS211440	Private Customer	256
81.21.43.0/24	AS30916	NetWay LTD	256
81.21.45.0/24	AS30916	NetWay LTD	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
81.21.187.1	AS39244 Teqnobase	`3.79ms` from Amsterdam, NL
81.21.186.15	AS39244 Teqnobase	`4.25ms` from Amsterdam, NL
81.21.185.16	AS39244 Teqnobase	`4.26ms` 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
37.251.83.101	AS1136 KPN B.V.	`1.16ms` from Amsterdam, NL
50.236.41.85	AS7922 Comcast Cable Communications, LLC	`1.43ms` from Atlanta, US
122.155.232.53	AS4651 National Telecom Public Company Limited	`0.88ms` from Bangkok, TH
76.19.94.213	AS7922 Comcast Cable Communications, LLC	`12.41ms` from Boston, US
20.22.241.69	AS8075 Microsoft Corporation	`0.34ms` from Boydton, US
201.47.184.165	AS18881 TELEFÔNICA BRASIL S.A	`1.39ms` from Brasilia, BR
149.200.99.149	AS5483 Magyar Telekom Plc.	`5.96ms` from Budapest, HU
75.103.181.133	AS19751 Endeavor Communications	`7.25ms` from Chicago, US
50.5.36.181	AS6181 Cincinnati Bell Telephone Company LLC	`2.30ms` from Cincinnati, US
79.242.31.165	AS3320 Deutsche Telekom AG	`5.30ms` from Duesseldorf, DE
93.229.230.165	AS3320 Deutsche Telekom AG	`7.06ms` from Frankfurt am Main, DE
219.135.118.5	AS4134 CHINANET-BACKBONE	`3.32ms` from Guangzhou, CN
95.234.144.69	AS3269 Telecom Italia S.p.A.	`2.14ms` from Milan, IT
109.3.18.117	AS15557 Societe Francaise Du Radiotelephone - SFR SA	`2.13ms` from Paris, FR
200.199.128.245	AS7738 V tal	`11.49ms` from Rio de Janeiro, BR
186.7.66.53	AS6400 Compañía Dominicana de Teléfonos S. A.	`6.46ms` from Santo Domingo, DO
121.152.90.229	AS4766 Korea Telecom	`4.25ms` from Seoul, KR
171.126.142.53	AS4837 CHINA UNICOM China169 Backbone	`7.37ms` from Taiyuan, CN
23.34.209.181	AS16625 Akamai Technologies, Inc.	`0.10ms` from Toronto, CA
172.74.27.149	AS11426 Charter Communications Inc	`9.03ms` from Ashburn, US
131.218.139.149	AS668 United States Department of Defense (DoD)	`2.66ms` from Ashburn, US
2.85.167.133	AS6799 Ote SA (Hellenic Telecommunications Organisation)	`9.81ms` from Athens, GR
73.54.203.197	AS7922 Comcast Cable Communications, LLC	`4.14ms` from Atlanta, US
166.210.68.53	AS14080 Telmex Colombia S.A.	`2.08ms` from Bogota, CO
41.164.133.69	AS36937 Liquid Telecommunications South Africa (Pty) Ltd	`2.18ms` from Cape Town, ZA

Traceroute

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

traceroute -a -n -q1 -f3 81.21.187.1

traceroute to 81.21.187.1 (81.21.187.1): 64 hops max, 52 byte packets

3 [] 185.1.95.14 1.185 ms

4 [AS6461] 193.28.62.43 1.15 ms

5 [AS32787] 2.21.125.41 1.069 ms

6 [AS39244] 81.21.187.1 4.07 ms

Measurement taken from

IPinfo ProbeNet in Amsterdam, NL

On January 19th 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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