66.99.128.0/18

AS6325 · Illinois Century Network

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Summary

Country	United States
Domain	illinois.gov
ASN	AS6325
Parent Range	66.99.0.0/16
Registry	ARIN
ID	ICN7

WHOIS Details

NetHandle:      NET-66-99-0-0-1
OrgID:          ILTN
Parent:         NET-66-0-0-0-0
NetName:        ICN7
NetRange:       66.99.0.0 - 66.99.255.255
NetType:        allocation
RegDate:        2001-04-09
Updated:        2015-11-16
TechHandle:     ZI83-ARIN
Source:         ARIN


OrgID:          ILTN
OrgName:        Illinois Century Network
CanAllocate:    
Street:         120 W Jefferson
Street:         Suite B
City:           Springfield
State/Prov:     IL
Country:        US
PostalCode:     62702
RegDate:        1970-01-01
Updated:        2025-09-24
ReferralServer: rwhois://rwhois.illinois.net:4321
OrgAdminHandle: ZI83-ARIN
OrgTechHandle:  RESER5-ARIN
OrgTechHandle:  WEBST193-ARIN
OrgTechHandle:  ZI83-ARIN
OrgAbuseHandle: ICNAB-ARIN
Source:         ARIN


POCHandle:      RESER5-ARIN
IsRole:         N
LastName:       Reserva
FirstName:      Chuck
Street:         120 West Jefferson, Springfield, Illinois, 62702
City:           Springfield
State/Prov:     IL
Country:        US
PostalCode:     62702
RegDate:        2025-09-23
Updated:        2025-09-23
OfficePhone:    +1-217-786-8872
Mailbox:        chuck.reserva@illinois.gov
Source:         ARIN


POCHandle:      ICNAB-ARIN
IsRole:         Y
LastName:       ICN Abuse
FirstName:      
Street:         120 W Jefferson
Street:         Suite B
City:           Springfield
State/Prov:     IL
Country:        US
PostalCode:     62702
RegDate:        2003-10-09
Updated:        2025-07-21
OfficePhone:    +1-217-524-3648
Mailbox:        doit.security@illinois.gov
Source:         ARIN


POCHandle:      WEBST193-ARIN
IsRole:         N
LastName:       Webster
FirstName:      Andrew
Street:         120 W Jefferson St
City:           Springfield
State/Prov:     IL
Country:        US
PostalCode:     62702
RegDate:        2025-07-21
Updated:        2025-07-21
OfficePhone:    +1-217-558-1106
Mailbox:        andy.webster@illinois.gov
Source:         ARIN


POCHandle:      ZI83-ARIN
IsRole:         Y
LastName:       Hostmaster
FirstName:      
Street:         120 W Jefferson
Street:         Suite B
City:           Springfield
State/Prov:     IL
Country:        US
PostalCode:     62702
RegDate:        2001-10-31
Updated:        2025-05-29
OfficePhone:    +1-815-936-4643
MobilePhone:    +1-779-801-4071
Mailbox:        DoIT.ICN.Hostmasternet@illinois.gov
Source:         ARIN

Overlapping Ranges

BGP prefixes that contain 66.99.128.0/18

Range	ASN	Company	Num of IPs
66.99.0.0/16	AS6325	Illinois Century Network	65,536

Nearby Ranges

BGP prefixes that overlap with 66.99.0.0/16

Range	ASN	Company	Num of IPs
66.99.0.0/16	AS6325	Illinois Century Network	65,536
66.99.240.0/23	AS46286	COOK COUNTY	512
66.99.5.0/24	AS19480	HAROLD WASHINGTON LIBRARY CENTER	256
66.99.209.0/24	AS6325	PALATINE CCSD 15	256
66.99.51.0/24	AS6325	MANNHEIM SD 83	256

Hosted domains

There are 38 domain names hosted across 17 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
66.99.138.100	cass.k12.il.us	15
66.99.142.47	rwhois.lib.il.us	6
66.99.170.26	swic.edu	3
66.99.140.49	ghsonline.net	1
66.99.138.97	roe51.k12.il.us	1
66.99.138.98	roe53.k12.il.us	1
66.99.140.8	bcsd5.org	1
66.99.138.91	roe26.k12.il.us	1
66.99.138.89	roe1.k12.il.us	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

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

IP Address	ASN	Details
66.99.140.217	AS6325 Illinois Century Network	`5.34ms` from Chicago, US
66.99.130.8	AS6325 Illinois Century Network	`7.24ms` from Chicago, US
66.99.191.209	AS6325 Illinois Century Network	`10.60ms` from Chicago, US
66.99.190.201	AS6325 Illinois Century Network	`8.10ms` from Chicago, US
66.99.155.6	AS6325 Illinois Century Network	`9.20ms` from Chicago, US
66.99.159.121	AS6325 Illinois Century Network	`9.23ms` from Chicago, US
66.99.169.106	AS6325 Illinois Century Network	`6.77ms` from Chicago, US
66.99.129.193	AS6325 Illinois Century Network	`7.22ms` from Chicago, US
66.99.170.193	AS6325 Illinois Century Network	`7.27ms` from Chicago, US
66.99.180.163	AS6325 Illinois Century Network	`7.41ms` from Chicago, US
66.99.142.81	AS6325 Illinois Century Network	`15.17ms` from Detroit, US
66.99.128.136	AS6325 Illinois Century Network	`7.38ms` from Chicago, US
66.99.143.3	AS6325 Illinois Century Network	`5.03ms` from Chicago, US

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
3.168.216.114	AS16509 Amazon.com, Inc.	`0.34ms` from Berlin, DE
213.30.211.2	AS8881 1&1 Versatel GmbH	`1.62ms` from Berlin, DE
52.26.148.50	AS16509 Amazon.com, Inc.	`0.17ms` from Boardman, US
97.247.155.82	AS6167 Verizon Business	`10.40ms` from Dallas, US
213.115.13.130	AS8434 Telenor Sverige AB	`0.44ms` from Goeteborg, SE
120.55.26.50	AS37963 Hangzhou Alibaba Advertising Co.,Ltd.	`3.98ms` from Hangzhou, CN
87.92.0.2	AS16086 DNA Oyj	`0.76ms` from Helsinki, FI
171.247.178.210	AS7552 Viettel Group	`1.02ms` from Ho Chi Minh City, VN
124.217.160.50	AS10118 Hutchison Telephone Company Limited	`12.53ms` from Hong Kong, HK
18.162.118.178	AS16509 Amazon.com, Inc.	`0.12ms` from Hong Kong, HK
58.220.158.210	AS4134 CHINANET-BACKBONE	`4.91ms` from Huai'an, CN
221.9.127.34	AS4837 CHINA UNICOM China169 Backbone	`16.03ms` from Liaoyang, CN
80.2.190.114	AS5089 Virgin Media Limited	`3.96ms` from London, GB
172.116.249.34	AS20001 Charter Communications Inc	`4.79ms` from Los Angeles, US
195.55.21.130	AS3352 TELEFONICA DE ESPANA S.A.U.	`8.96ms` from Madrid, ES
165.98.54.114	AS28036 Telefonia Celular de Nicaragua SA.	`0.59ms` from Managua, NI
60.254.31.66	AS17488 Hathway IP Over Cable Internet	`6.79ms` from Mumbai, IN
112.85.188.226	AS4837 CHINA UNICOM China169 Backbone	`6.89ms` from Nanjing, CN
120.209.133.114	AS9808 China Mobile Communications Group Co., Ltd.	`7.37ms` from Nanjing, CN
58.173.3.82	AS1221 Telstra Limited	`5.25ms` from Perth, AU
44.195.78.114	AS14618 Amazon.com, Inc.	`0.17ms` from Reston, US
143.95.153.130	AS46606 Unified Layer	`1.94ms` from Salt Lake City, US
73.231.201.66	AS7922 Comcast Cable Communications, LLC	`6.75ms` from San Jose, US
204.13.12.2	AS32952 zColo	`0.53ms` from Secaucus, US
211.159.212.34	AS45090 Shenzhen Tencent Computer Systems Company Limited	`1.20ms` from Shanghai, CN

Traceroute

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

traceroute -a -n -q1 -f7 -m10 66.99.146.254

traceroute to 66.99.146.254 (66.99.146.254): 10 hops max, 52 byte packets

7 [] 206.81.80.77 1.007 ms

8 *

9 *

10 *

Measurement taken from

IPinfo ProbeNet in Seattle, US

On November 22nd 2025

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.

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