Data as of Nov 5, 2026
210.103.128.0/17
No anonymizer space · no proxy exits in 30 daysSejong Networks
Announcements
Nesting
More-specifics by size
Sized by addresses, colored by each announcement's type. Click a tile with children to zoom in, a leaf to open it.
More specific
Announcements inside
| Prefix | Origin | Type | Holder | RPKI |
|---|---|---|---|---|
| 210.103.137.0/24 since Dec 2023 | AS131866 | Hosting | Sejong Networks | |
| 210.103.138.0/24 since Dec 2023 | AS131866 | Hosting | Sejong Networks | |
| 210.103.142.0/24 since Dec 2023 | AS131866 | Hosting | Sejong Networks | |
| 210.103.143.0/24 since Dec 2023 | AS131866 | Hosting | Sejong Networks | |
| 210.103.152.0/24 since Nov 2023 | AS38676 | Hosting | Sejong Networks | |
| 210.103.153.0/24 since Nov 2023 | AS38676 | Hosting | Sejong Networks | |
| 210.103.154.0/24 since Nov 2023 | AS38676 | Hosting | Sejong Networks | |
| 210.103.155.0/24 since Nov 2023 | AS38676 | Hosting | Sejong Networks | |
| 210.103.176.0/24 since Nov 2023 | AS38676 | Hosting | Sejong Networks | |
| 210.103.187.0/24 since Dec 2023 | AS131866 | Hosting | Sejong Networks | |
| 210.103.188.0/24 since Dec 2023 | AS131866 | Hosting | Sejong Networks | |
| 210.103.189.0/24 since Dec 2023 | AS131866 | Hosting | Sejong Networks | |
| 210.103.190.0/24 since Dec 2023 | AS131866 | Hosting | Sejong Networks | |
| 210.103.191.0/24 since Dec 2023 | AS131866 | Hosting | Sejong Networks | |
| 210.103.203.0/24 since Mar 2020 | AS23593 | Business | Sejong Networks | |
| 210.103.240.0/24 since Apr 2013 | AS10158 | Business | Sejong Networks | |
| 210.103.241.0/24 since Apr 2013 | AS10158 | Business | Sejong Networks | |
| 210.103.242.0/24 since Apr 2013 | AS10158 | Business | Sejong Networks | |
| 210.103.243.0/24 since May 2013 | AS10158 | Business | Sejong Networks | |
| 210.103.244.0/24 since May 2013 | AS10158 | Business | Sejong Networks | |
| 210.103.245.0/24 since May 2013 | AS10158 | Business | Sejong Networks | |
| 210.103.246.0/24 since May 2013 | AS10158 | Business | Sejong Networks | |
| 210.103.247.0/24 since May 2013 | AS10158 | Business | Sejong Networks | |
| 210.103.253.0/24 since Jun 2025 | AS10178 | Business | Sejong Networks | |
| 210.103.254.0/24 since Jun 2025 | AS10178 | Business | Sejong Networks |
Registrations in this block
The registry's network records over the announcement: those covering it, widest first, then every record inside it, under its parent.
| Range | Addresses | Netname | Holder | Type | Created | Abuse contact |
|---|---|---|---|---|---|---|
| 210.103.128.0/17 | 32,768 | SEJONG | Sejong Networks | ALLOCATED PORTABLE | — | irt@ |
| └ 210.103.224.0/19 | 8,192 | KRNIC-KR | KRNIC | ALLOCATED PORTABLE | — | irt@ |
Composition
The types across the prefix's announced space, by addresses.
Announced space
Address share
Announced space
Types across the prefix
32,768 addresses
| Type | Addresses | Share | Ranges | |
|---|---|---|---|---|
| Internet provider | 26,368 | 80% | 10 | |
| Hosting | 5,632 | 17% | 22 | |
| Business | 768 | 2.3% | 3 |
Network & registry
Origin network
AS9848
KR
- Name
- Sejong Networks
- Type
- Internet provider
- Registered
- Feb 4, 2000
- Domain
- sejongnetworks.com
- Website
- en.sejongnetworks.com/
- Industry
- Internet Service Provider (ISP)
- Spamhaus ASN-DROP
- not listed
Routing timeline
Who has announced this prefix
Summary
Routing history
- Pattern
- Stable
- First seen
- May 2005
- Current origin since
- May 2005 · 21 yr
- Origin networks
- 1
IRR
Route objects on the exact prefix
IRR inside
Route objects inside
| Prefix | Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|---|
| 210.103.161.0/24 | AS4670 | REACH | REACH (Customer Route) | MAINT-REACH-NOC | Jan 9, 2005 |
| 210.103.192.0/23 | AS9693 | RADB | contact [email protected] if necessary | MAINT-AS3786 | Nov 13, 2023 |
| 210.103.192.0/24 | AS9693 | RADB | contact [email protected] if necessary | MAINT-AS3786 | Nov 13, 2023 |
| 210.103.192.0/24 | AS9701 | REACH | REACH (Customer Route) | MAINT-REACH-NOC | Sep 6, 2005 |
| 210.103.193.0/24 | AS9318 | RADB | SK Broadband | MAINT-AS9318 | Nov 13, 2023 |
| 210.103.193.0/24 | AS9693 | RADB | Sejong Telecom | MAINT-AS4766 | Nov 13, 2023 |
| 210.103.193.0/24 | AS9318 | NTTCOM | Proxy-registered route object | MAINT-AS9304 | Jan 10, 2005 |
| 210.103.193.0/24 | AS9318 | REACH | REACH (Customer Route) | MAINT-REACH-NOC | Apr 28, 2006 |
| 210.103.193.0/24 | AS9701 | REACH | REACH (Customer Route) | MAINT-REACH-NOC | Sep 6, 2005 |
| 210.103.194.0/24 | AS9318 | RADB | SK Broadband | MAINT-AS9318 | Nov 13, 2023 |
| 210.103.194.0/24 | AS9693 | RADB | contact [email protected] if necessary | MAINT-AS3786 | Nov 13, 2023 |
| 210.103.194.0/24 | AS9318 | NTTCOM | Proxy-registered route object | MAINT-AS9304 | Jan 10, 2005 |
| 210.103.194.0/24 | AS9318 | REACH | REACH (Customer Route) | MAINT-REACH-NOC | Apr 28, 2006 |
| 210.103.194.0/24 | AS9701 | REACH | REACH (Customer Route) | MAINT-REACH-NOC | Sep 6, 2005 |
| 210.103.200.0/24 | AS23593 | RADB | SejongTelecom.co.ltd | MAINT-AS4670 | Nov 13, 2023 |
| 210.103.201.0/24 | AS23593 | RADB | SejongTelecom.co.ltd | MAINT-AS4670 | Nov 13, 2023 |
| 210.103.202.0/24 | AS23593 | RADB | SejongTelecom.co.ltd | MAINT-AS4670 | Nov 13, 2023 |
| 210.103.204.0/24 | AS23593 | RADB | SejongTelecom.co.ltd | MAINT-AS4670 | Nov 13, 2023 |
| 210.103.205.0/24 | AS23593 | RADB | SejongTelecom.co.ltd | MAINT-AS4670 | Nov 13, 2023 |
| 210.103.206.0/24 | AS23593 | RADB | SejongTelecom.co.ltd | MAINT-AS4670 | Nov 13, 2023 |
| 210.103.207.0/24 | AS23593 | RADB | SejongTelecom.co.ltd | MAINT-AS4670 | Nov 13, 2023 |
| 210.103.208.0/24 | AS23593 | RADB | SejongTelecom.co.ltd | MAINT-AS4670 | Nov 13, 2023 |
| 210.103.248.0/21 | AS10158 | RADB | Kakao | MAINT-AS9318 | Sep 30, 2025 |
Whois
Registration for this announcement
- Range
- 210.
103. 128. 0/ 17 - Netname
- SEJONG-KR
- Registrant
- Sejong Networks
- Registrant country
- KR
- Organization
- Sejong Networks
- Org country
- KR
- Type
- ALLOCATED PORTABLE
- Created
- Not stated by the registry
- Maintainer
- MNT-KRNIC-AP
- RIR
- APNIC
- Country
- KR
- Delegated
- Dec 6, 1997
- Status
- assigned
Report abuse
Abuse contact
- irt@
nic. or. kr - Name
- IRT-KRNIC-KR
- Handle
- IRT-KRNIC-KR