217.28.80.0/21

AS51800 · FIBER Network s.r.o.

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Summary

Country	Czechia
Domain	fiber.cz
ASN	AS51800
Registry	RIPE
ID	FIBER-NETWORKS-APA

WHOIS Details

inetnum:        217.28.80.0 - 217.28.87.255
netname:        FIBER-NETWORKS-APA
descr:          FIBER Networks customers
country:        CZ
org:            ORG-FNs4-RIPE
admin-c:        JK6086-RIPE
admin-c:        LM1397-RIPE
tech-c:         JK6086-RIPE
tech-c:         LM1397-RIPE
status:         ASSIGNED PA
mnt-by:         MNT-FIBERCZ
created:        2016-01-26T17:27:34Z
last-modified:  2016-01-26T17:27:34Z
source:         RIPE
abuse-email:    abuse@fiber.cz
abuse-c:        AFBR1
abuse-org:      ORG-FNs4-RIPE

organisation:   ORG-FNs4-RIPE
org-name:       FIBER Network s.r.o.
country:        CZ
org-type:       LIR
address:        Cimburkova 369/16
address:        130 00
address:        Prague 3
address:        CZECH REPUBLIC
phone:          +420222742742
fax-no:         +420222742744
e-mail:         jiri.kobilak@fiber.cz
abuse-c:        AFBR1
mnt-ref:        RIPE-NCC-HM-MNT
mnt-ref:        MNT-FIBERCZ
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         MNT-FIBERCZ
created:        2010-10-25T13:22:51Z
last-modified:  2020-12-16T13:18:11Z
source:         RIPE

person:         Jiri Kobilak
address:        FIBER Network
address:        Cimburkova 369/16
address:        13000 Praha 3
address:        Czech Republic / EU
e-mail:         info@fiber.cz
nic-hdl:        JK6086-RIPE
created:        2010-10-27T23:27:39Z
last-modified:  2010-11-10T18:23:34Z
source:         RIPE
phone:          +420222742742
mnt-by:         MNT-COBOOL

person:         Lukas Mesani
phone:          +420-222-742-740
address:        Czech Republic
nic-hdl:        LM1397-RIPE
mnt-by:         MNT-FRODO
created:        2006-06-07T13:57:53Z
last-modified:  2020-03-03T14:23:08Z
source:         RIPE

route:          217.28.80.0/21
descr:          CZFIBERNET1
origin:         AS51800
mnt-by:         MNT-FIBERCZ
created:        2010-11-09T17:53:32Z
last-modified:  2010-11-09T17:53:32Z
source:         RIPE

Nearby Ranges

BGP prefixes that overlap with 217.28.0.0/16

Range	ASN	Company	Num of IPs
217.28.32.0/20	AS12684	SES ASTRA S.A.	4,096
217.28.144.0/20	AS12741	Petrotel Sp. z o.o.	4,096
217.28.0.0/20	AS13122	Manx Telecom Trading Ltd	4,096
217.28.224.0/20	AS200350	Yandex.Cloud LLC	4,096
217.28.48.0/20	AS28886	RETN Limited	4,096
217.28.112.0/20	AS29270	Triskel srl	4,096
217.28.176.0/20	AS29689	Origo ehf	4,096
217.28.240.0/20	AS3327		4,096
217.28.192.0/20	AS34385	Tripnet AB	4,096
217.28.168.0/21	AS3292	Stibo Software Group A/S	2,048
217.28.8.0/21	AS13122	Residential ADSL - Manx Telecom	2,048
217.28.16.0/21	AS25582	NWIP Ltd	2,048
217.28.72.0/21	AS48524	INTERRA telecommunications group, Ltd.	2,048
217.28.88.0/21	AS57707	FIBER Networks customers	2,048
217.28.24.0/21	AS398721	Cogeco Connexion inc	2,048
217.28.0.0/21	AS13122	Residential ADSL - Manx Telecom	2,048
217.28.68.0/22	AS39120	Convergenze S.p.A.	1,024
217.28.164.0/22	AS3292	Stibo Software Group A/S	1,024
217.28.64.0/22	AS44092	HAL Service SpA	1,024
217.28.160.0/23	AS3292	Stibo Software Group A/S	512
217.28.140.0/24	AS204057	Duomenu apdorojimo centras LTD	256
217.28.143.0/24	AS20879	Digi Portugal, Sociedade Unipessoal LDA	256
217.28.133.0/24	AS210045	Blackrock Clinic Unlimited Company	256
217.28.128.0/24	AS212384	Xantho UAB	256
217.28.130.0/24	AS56322	MB Eisina	256
217.28.136.0/24	AS56488	Eis S.r.l.	256
217.28.162.0/24	AS3292	Stibo Software Group A/S	256
217.28.163.0/24	AS7018	Stibo Systems Inc	256
217.28.131.0/24	AS34859	Navant LLC	256
217.28.137.0/24	AS199524	G-Core Labs S.A.	256
217.28.134.0/24	AS203821	Enformatel Sp. z o.o.	256
217.28.139.0/24	AS208425	Osbil Technology Ltd.	256

Hosted domains

There are 38 domain names hosted across 16 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
217.28.81.67	lesovnazofin.cz	7
217.28.81.68	ccshpraha.cz	7
217.28.82.23	primerack.cz	6
217.28.80.23	praha3.net	4
217.28.80.2	kobnet.cz	3
217.28.84.4	neutral.cz	2
217.28.82.9	myitguru.eu	1
217.28.82.70	blankanet.cz	1
217.28.81.66	katovice.cz	1
217.28.84.38	dsal.cc	1
217.28.84.6	mamlux.eu	1
217.28.84.5	mamlux.cz	1
217.28.81.71	katovice.cz	1
217.28.82.85	tejapo.cz	1
217.28.82.51	jagos.eu	1
217.28.84.8	kramekuzvonicky.cz	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

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Pingable IPs

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

IP Address	ASN	Details
217.28.84.65	AS51800 FIBER Network s.r.o.	`0.35ms` from Prague, CZ
217.28.81.17	AS51800 FIBER Network s.r.o.	`0.35ms` from Prague, CZ
217.28.82.56	AS51800 FIBER Network s.r.o.	`0.52ms` from Prague, CZ
217.28.80.46	AS51800 FIBER Network s.r.o.	`0.30ms` from Prague, CZ

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
186.124.10.181	AS7303 Telecom Argentina S.A.	`1.50ms` from Buenos Aires, AR
79.210.73.69	AS3320 Deutsche Telekom AG	`4.08ms` from Frankfurt am Main, DE
213.182.143.213	AS8881 1&1 Versatel GmbH	`0.60ms` from Hamburg, DE
212.53.149.37	AS8893 Artfiles New Media GmbH	`0.46ms` from Hamburg, DE
39.62.221.149	AS17557 Pakistan Telecommunication Company Limited	`2.66ms` from Lahore, PK
90.216.24.21	AS5607 Sky UK Limited	`6.13ms` from London, GB
47.249.53.197	AS33363 Charter Communications, Inc	`10.97ms` from Los Angeles, US
110.147.210.69	AS1221 Telstra Limited	`12.31ms` from Melbourne, AU
83.237.79.197	AS8359 MTS PJSC	`1.40ms` from Moscow, RU
95.181.15.5	AS39927 E-Light-Telecom Ltd.	`4.63ms` from Novosibirsk, RU
15.204.53.229	AS16276 OVH SAS	`0.33ms` from Portland, US
1.253.248.69	AS9318 SK Broadband Co Ltd	`6.80ms` from Seoul, KR
218.236.202.85	AS9318 SK Broadband Co Ltd	`7.16ms` from Seoul, KR
23.35.201.197	AS16625 Akamai Technologies, Inc.	`5.66ms` from Sioux Falls, US
36.235.158.197	AS3462 Data Communication Business Group	`2.47ms` from Taichung, TW
113.200.190.133	AS4837 CHINA UNICOM China169 Backbone	`2.44ms` from Xi'an, CN
108.167.107.149	AS11955 Charter Communications Inc	`8.68ms` from Atlanta, US
202.180.67.117	AS9790 Two Degrees Networks Limited	`0.49ms` from Auckland, NZ
60.26.95.165	AS4837 CHINA UNICOM China169 Backbone	`5.76ms` from Beijing, CN
181.6.86.53	AS7303 Telecom Argentina S.A.	`12.78ms` from Buenos Aires, AR
184.59.222.181	AS10796 Charter Communications Inc	`16.38ms` from Chicago, US
80.62.120.149	AS3292 TDC Holding A/S	`1.21ms` from Copenhagen, DK
34.174.167.21	AS396982 Google LLC	`0.13ms` from Dallas, US
146.0.225.245	AS29066 velia.net Internetdienste GmbH	`0.27ms` from Frankfurt am Main, DE
80.130.173.133	AS3320 Deutsche Telekom AG	`7.80ms` from Frankfurt am Main, DE

Traceroute

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

traceroute -a -n -q1 -f2 -m6 217.28.86.0

traceroute to 217.28.86.0 (217.28.86.0): 6 hops max, 52 byte packets

2 [AS53340] 192.228.109.93 1003.555 ms

3 [AS53667] 198.251.87.1 0.326 ms

4 *

5 *

6 *

Measurement taken from

IPinfo ProbeNet in Las Vegas, US

On March 13th 2026

What are IP address ranges?

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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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