asn.dev

Address space

AS3488 JAXANET Information Systems Department, Japan Aerospace Exploration Agency

Hosting APNIC

IPv4 prefixes 51 115K addresses
IPv6 prefixes 0
Most common size /24 IPv4
Flagged 17

Shape

IPv4 prefix sizes

All IPv4
/18
/18: 3
3
/19
/19: 4
4
/20
/20: 3
3
/21
/21: 5
5
/22
/22: 5
5
/23
/23: 6
6
/24
/24: 8
8
/25
/25: 2
2
/26
/26: 2
2
/27
/27: 2
2
/28
/28: 2
2
/29
/29: 2
2
/30
/30: 2
2
/31
/31: 3
3
/32
/32: 2
2

A wall of /24s usually means many small customer assignments or fine-grained traffic engineering; a few short prefixes means large contiguous allocations announced whole.

Shape

IPv6 prefix sizes

All IPv6

This network announces no IPv6 we can see.

Geography

Where the space lands

CountryNamePrefixes
JPJapan51

Review

Flagged prefixes

17 of 51
PrefixFamilyAddressesCountryFlags
133.56.13.0/25IPv4128JPToo specific
133.56.13.128/29IPv48JPToo specific
133.56.13.136/31IPv42JPToo specific
133.56.13.138/32IPv41JPToo specific
133.56.13.139/32IPv41JPToo specific
133.56.13.140/30IPv44JPToo specific
133.56.13.144/28IPv416JPToo specific
133.56.13.160/27IPv432JPToo specific
133.56.13.192/26IPv464JPToo specific
133.74.120.0/26IPv464JPToo specific
133.74.120.64/31IPv42JPToo specific
133.74.120.66/31IPv42JPToo specific
133.74.120.68/30IPv44JPToo specific
133.74.120.72/29IPv48JPToo specific
133.74.120.80/28IPv416JPToo specific
133.74.120.96/27IPv432JPToo specific
133.74.120.128/25IPv4128JPToo specific

A flag is an observation, not an accusation. Very large and very specific prefixes are both legitimate in the right context.