[REN-BGP-stats-all] IPv4 R&E Routing Table Report - CERNET (R&E) view
REN Routing Table Report
cscora at bgp.nsrc.org
Mon May 5 20:10:43 UTC 2025
IPv4 R&E Routing Table Report 20:10 GMT Mon 05 May, 2025
IPv4 BGP Table (R&E) as seen at CERNET.
Report Website: https://bgp.nsrc.org/REN
Detailed Analysis: https://bgp.nsrc.org/REN/CERNET/
Analysis Summary
----------------
BGP routing table entries examined: 18108
Prefixes after maximum aggregation (per Origin AS): 10119
Deaggregation factor: 1.79
Unique aggregates announced (without unneeded subnets): 11180
Number of IPv4 prefixes with a valid ROA: 7544
Number of IPv4 prefixes with an invalid ROA: 19
Number of IPv4 prefixes with no ROA: 10545
Total ASes present in the Internet Routing Table: 2697
Prefixes per ASN: 6.71
Origin-only ASes present in the Internet Routing Table: 2349
Origin ASes announcing only one prefix: 1031
Transit ASes present in the Internet Routing Table: 348
Transit-only ASes present in the Internet Routing Table: 57
Paths with bogon ASNs present in the IPv4 Routing Table: 0
Average AS path length visible in the Internet Routing Table: 6.0
Max AS path length visible: 19
Max AS path prepend of ASN (395156) 12
Prefixes from unregistered ASNs in the Routing Table: 34
Number of instances of unregistered ASNs: 34
Number of 32-bit ASNs allocated by the RIRs: 46335
Number of 32-bit ASNs visible in the Routing Table: 667
Prefixes from 32-bit ASNs in the Routing Table: 1846
Number of bogon 32-bit ASNs visible in the Routing Table: 0
Special use prefixes present in the Routing Table: 0
Prefixes being announced from unallocated address space: 2
Number of addresses announced to Internet: 194256784
Equivalent to 11 /8s, 148 /16s and 31 /24s
Percentage of available address space announced: 5.2
Percentage of allocated address space announced: 5.2
Percentage of available address space allocated: 100.0
Percentage of address space in use by end-sites: 99.6
Total number of prefixes smaller than registry allocations: 2242
APNIC Region Analysis Summary
-----------------------------
Prefixes being announced by APNIC Region ASes: 4189
Total APNIC prefixes after maximum aggregation: 2186
APNIC Deaggregation factor: 1.92
Prefixes being announced from the APNIC address blocks: 4189
Unique aggregates announced from the APNIC address blocks: 2630
APNIC Region origin ASes present in the Internet Routing Table: 585
APNIC Prefixes per ASN: 7.16
APNIC Region origin ASes announcing only one prefix: 245
APNIC Region transit ASes present in the Internet Routing Table: 46
Average APNIC Region AS path length visible: 4.5
Max APNIC Region AS path length visible: 12
Number of APNIC region 32-bit ASNs visible in the Routing Table: 238
Number of APNIC addresses announced to Internet: 43922176
Equivalent to 2 /8s, 158 /16s and 51 /24s
APNIC AS Blocks 4608-4864, 7467-7722, 9216-10239, 17408-18431
(pre-ERX allocations) 23552-24575, 37888-38911, 45056-46079, 55296-56319,
58368-59391, 63488-64098, 64297-64395, 131072-155961
APNIC Address Blocks 1/8, 14/8, 27/8, 36/8, 39/8, 42/8, 43/8,
49/8, 58/8, 59/8, 60/8, 61/8, 101/8, 103/8,
106/8, 110/8, 111/8, 112/8, 113/8, 114/8, 115/8,
116/8, 117/8, 118/8, 119/8, 120/8, 121/8, 122/8,
123/8, 124/8, 125/8, 126/8, 133/8, 150/8, 153/8,
163/8, 171/8, 175/8, 180/8, 182/8, 183/8, 202/8,
203/8, 210/8, 211/8, 218/8, 219/8, 220/8, 221/8,
222/8, 223/8,
ARIN Region Analysis Summary
----------------------------
Prefixes being announced by ARIN Region ASes: 8058
Total ARIN prefixes after maximum aggregation: 4475
ARIN Deaggregation factor: 1.80
Prefixes being announced from the ARIN address blocks: 8105
Unique aggregates announced from the ARIN address blocks: 4907
ARIN Region origin ASes present in the Internet Routing Table: 1247
ARIN Prefixes per ASN: 6.50
ARIN Region origin ASes announcing only one prefix: 443
ARIN Region transit ASes present in the Internet Routing Table: 155
Average ARIN Region AS path length visible: 7.3
Max ARIN Region AS path length visible: 19
Number of ARIN region 32-bit ASNs visible in the Routing Table: 215
Number of ARIN addresses announced to Internet: 85912320
Equivalent to 5 /8s, 30 /16s and 235 /24s
ARIN AS Blocks 1-1876, 1902-2042, 2044-2046, 2048-2106
(pre-ERX allocations) 2138-2584, 2615-2772, 2823-2829, 2880-3153
3354-4607, 4865-5119, 5632-6655, 6912-7466
7723-8191, 10240-12287, 13312-15359, 16384-17407
18432-20479, 21504-23551, 25600-26591,
26624-27647, 29696-30719, 31744-33791
35840-36863, 39936-40959, 46080-47103
53248-55295, 62464-63487, 64198-64296, 393216-402332
ARIN Address Blocks 3/8, 4/8, 6/8, 7/8, 8/8, 9/8, 11/8,
12/8, 13/8, 15/8, 16/8, 17/8, 18/8, 19/8,
20/8, 21/8, 22/8, 23/8, 24/8, 26/8, 28/8,
29/8, 30/8, 32/8, 33/8, 34/8, 35/8, 38/8,
40/8, 44/8, 45/8, 47/8, 48/8, 50/8, 52/8,
54/8, 55/8, 56/8, 63/8, 64/8, 65/8, 66/8,
67/8, 68/8, 69/8, 70/8, 71/8, 72/8, 73/8,
74/8, 75/8, 76/8, 96/8, 97/8, 98/8, 99/8,
100/8, 104/8, 107/8, 108/8, 128/8, 129/8, 130/8,
131/8, 132/8, 134/8, 135/8, 136/8, 137/8, 138/8,
139/8, 140/8, 142/8, 143/8, 144/8, 146/8, 147/8,
148/8, 149/8, 152/8, 155/8, 156/8, 157/8, 158/8,
159/8, 160/8, 161/8, 162/8, 164/8, 165/8, 166/8,
167/8, 168/8, 169/8, 170/8, 172/8, 173/8, 174/8,
184/8, 192/8, 198/8, 199/8, 204/8, 205/8, 206/8,
207/8, 208/8, 209/8, 214/8, 215/8, 216/8,
RIPE Region Analysis Summary
----------------------------
Prefixes being announced by RIPE Region ASes: 3624
Total RIPE prefixes after maximum aggregation: 2895
RIPE Deaggregation factor: 1.25
Prefixes being announced from the RIPE address blocks: 3609
Unique aggregates announced from the RIPE address blocks: 2934
RIPE Region origin ASes present in the Internet Routing Table: 653
RIPE Prefixes per ASN: 5.53
RIPE Region origin ASes announcing only one prefix: 281
RIPE Region transit ASes present in the Internet Routing Table: 105
Average RIPE Region AS path length visible: 4.3
Max RIPE Region AS path length visible: 14
Number of RIPE region 32-bit ASNs visible in the Routing Table: 149
Number of RIPE addresses announced to Internet: 58063760
Equivalent to 3 /8s, 117 /16s and 251 /24s
RIPE AS Blocks 1877-1901, 2043, 2047, 2107-2136, 2585-2614
(pre-ERX allocations) 2773-2822, 2830-2879, 3154-3353, 5377-5631
6656-6911, 8192-9215, 12288-13311, 15360-16383
20480-21503, 24576-25599, 28672-29695
30720-31743, 33792-35839, 38912-39935
40960-45055, 47104-52223, 56320-58367
59392-61439, 61952-62463, 64396-64495
196608-216475
RIPE Address Blocks 2/8, 5/8, 25/8, 31/8, 37/8, 46/8, 51/8,
53/8, 57/8, 62/8, 77/8, 78/8, 79/8, 80/8,
81/8, 82/8, 83/8, 84/8, 85/8, 86/8, 87/8,
88/8, 89/8, 90/8, 91/8, 92/8, 93/8, 94/8,
95/8, 109/8, 141/8, 145/8, 151/8, 176/8, 178/8,
185/8, 188/8, 193/8, 194/8, 195/8, 212/8, 213/8,
217/8,
LACNIC Region Analysis Summary
------------------------------
Prefixes being announced by LACNIC Region ASes: 1121
Total LACNIC prefixes after maximum aggregation: 415
LACNIC Deaggregation factor: 2.70
Prefixes being announced from the LACNIC address blocks: 1121
Unique aggregates announced from the LACNIC address blocks: 515
LACNIC Region origin ASes present in the Internet Routing Table: 128
LACNIC Prefixes per ASN: 8.76
LACNIC Region origin ASes announcing only one prefix: 54
LACNIC Region transit ASes present in the Internet Routing Table: 21
Average LACNIC Region AS path length visible: 7.5
Max LACNIC Region AS path length visible: 13
Number of LACNIC region 32-bit ASNs visible in the Routing Table: 58
Number of LACNIC addresses announced to Internet: 3974144
Equivalent to 0 /8s, 60 /16s and 164 /24s
LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247,
61440-61951, 64099-64197, 262144-274844 + ERX transfers
LACNIC Address Blocks 177/8, 179/8, 181/8, 186/8, 187/8, 189/8, 190/8,
191/8, 200/8, 201/8,
AfriNIC Region Analysis Summary
-------------------------------
Prefixes being announced by AfriNIC Region ASes: 1082
Total AfriNIC prefixes after maximum aggregation: 142
AfriNIC Deaggregation factor: 7.62
Prefixes being announced from the AfriNIC address blocks: 1082
Unique aggregates announced from the AfriNIC address blocks: 192
AfriNIC Region origin ASes present in the Internet Routing Table: 24
AfriNIC Prefixes per ASN: 45.08
AfriNIC Region origin ASes announcing only one prefix: 8
AfriNIC Region transit ASes present in the Internet Routing Table: 6
Average AfriNIC Region AS path length visible: 6.0
Max AfriNIC Region AS path length visible: 9
Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 7
Number of AfriNIC addresses announced to Internet: 2383872
Equivalent to 0 /8s, 36 /16s and 96 /24s
AfriNIC AS Blocks 36864-37887, 327680-329727 & ERX transfers
AfriNIC Address Blocks 41/8, 102/8, 105/8, 154/8, 196/8, 197/8,
APNIC Region per AS prefix count summary
----------------------------------------
ASN No of nets /20 equiv MaxAgg Description
2907 624 2170 464 SINET-AS Research Organization of Informa
1237 194 74 146 KREONET-AS-KR KISTI, KR
58647 182 18 2 KAGAWAU-AS Kagawa University, JP
7575 174 282 117 AARNET-AS-AP Australian Academic and Rese
55824 147 19 21 NKN-CORE-NW NKN Core Network, IN
4538 114 4176 70 ERX-CERNET-BKB China Education and Resear
4762 75 4 1 MAHIDOL-BORDER-AS Mahidol University, Tha
4621 67 37 9 UNINET-AS-AP UNINET-, TH
1659 60 1210 34 ERX-TANET-ASN1 Taiwan Academic Network TA
23570 59 5 11 INCHEON-AS-KR UNIVERSITY OF INCHEON, KR
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-ASnet-APNIC
ARIN Region per AS prefix count summary
---------------------------------------
ASN No of nets /20 equiv MaxAgg Description
2152 543 507 99 CENIC-2152, US
2920 222 44 49 LACOE, US
376 202 162 151 RISQ-AS, CA
5786 199 16 1 UPRENET, PR
18558 140 18 5 NETBLK-RCOEK, US
81 129 519 34 NCREN, US
23024 99 7 17 OCDE, US
21976 90 34 16 NJEDGE-NET, US
237 85 542 51 MERIT-AS-14, US
1736 79 16 1 MU-AS, US
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-ASnet-ARIN
RIPE Region per AS prefix count summary
---------------------------------------
ASN No of nets /20 equiv MaxAgg Description
680 284 1899 250 DFN Verein zur Foerderung eines Deutschen
786 195 1750 187 JANET Jisc Services Limited, GB
559 114 533 104 SWITCH Peering requests: peering at switch.c
8895 109 24 5 ISU Internet Services Unit ISU, SA
1103 98 1743 84 SURFNET-NL SURFnet, The Netherlands, NL
2614 89 26 69 ROEDUNET, RO
137 82 677 77 ASGARR Consortium GARR, IT
1930 79 88 74 RCCN Fundacao para a Ciencia e a Tecnolog
3267 79 29 69 NIKS, RU
553 75 366 75 BELWUE BelWue-Koordination, DE
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-ASnet-RIPE
LACNIC Region per AS prefix count summary
-----------------------------------------
ASN No of nets /20 equiv MaxAgg Description
1916 241 178 41 Rede Nacional de Ensino e Pesquisa, BR
11340 110 25 52 Red Universitaria Nacional, CL
271640 68 8 1 UNIVERSIDADE FEDERAL DE VICOSA, BR
2715 52 100 36 Fundacao Carlos Chagas Filho de Amparo a
61468 52 3 21 CEDIA, EC
19611 48 17 2 Associacao Antonio Vieira - Unisinos, BR
28614 38 2 2 Fundacao Universidade Regional de Blumena
1251 37 31 26 FUNDACAO DE AMPARO A PESQUISA DO ESTADO S
3596 37 8 4 Universidad Autonoma Metropolitana, MX
20191 28 16 1 Pontificia Universidad Catolica de Chile,
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-ASnet-LACNIC
AfriNIC Region per AS prefix count summary
------------------------------------------
ASN No of nets /20 equiv MaxAgg Description
36914 537 82 3 KENET-AS, KE
2018 372 318 69 TENET-1, ZA
8094 47 48 18 PUKNET, ZA
37215 34 8 1 MAREN, MW
6879 24 2 9 ENSTINET-, EG
37501 11 49 6 UOFS, ZA
327700 11 16 1 MoRENet, MZ
37654 10 1 6 RwEdNet-AS, RW
36982 8 33 8 UCT, ZA
327798 4 0 3 BERNET, BI
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-ASnet-AFRINIC
Global Per AS prefix count summary
----------------------------------
ASN No of nets /20 equiv MaxAgg Description
2907 624 2170 464 SINET-AS Research Organization of Informa
2152 543 507 99 CENIC-2152, US
36914 537 82 3 KENET-AS, KE
2018 372 318 69 TENET-1, ZA
680 284 1899 250 DFN Verein zur Foerderung eines Deutschen
1916 241 178 41 Rede Nacional de Ensino e Pesquisa, BR
2920 222 44 49 LACOE, US
376 202 162 151 RISQ-AS, CA
5786 199 16 1 UPRENET, PR
786 195 1750 187 JANET Jisc Services Limited, GB
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-ASnet
Global Per AS Maximum Aggregation summary
-----------------------------------------
ASN No of nets Net Savings Description
36914 537 534 KENET-AS, KE
2152 543 444 CENIC-2152, US
2018 372 303 TENET-1, ZA
1916 241 200 Rede Nacional de Ensino e Pesquisa, BR
5786 199 198 UPRENET, PR
58647 182 180 KAGAWAU-AS Kagawa University, JP
2920 222 173 LACOE, US
18558 140 135 NETBLK-RCOEK, US
55824 147 126 NKN-CORE-NW NKN Core Network, IN
8895 109 104 ISU Internet Services Unit ISU, SA
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-CIDRnet
List of Unregistered Origin ASNs (Global)
-----------------------------------------
Bad AS Designation Net Originated Transit AS Transit AS Name
36288 UNALLOCATED 64.79.154.0/24 293 ESNET, US
26971 UNALLOCATED 129.111.0.0/16 276 OTS-AS-276, US
26898 UNALLOCATED 131.187.248.0/22 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.248.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.249.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.250.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.251.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 198.30.187.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 208.108.80.0/20 3112 OARNET-AS-1, US
26898 UNALLOCATED 208.108.80.0/24 3112 OARNET-AS-1, US
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-badAS
Advertised Unallocated Addresses
--------------------------------
Unassigned Network ASN Information AS Name
202.14.117.0/24 Origin: 17827 STOU-AS-TH Sukhothai Thammathirat Open U
202.14.117.0/24 Transit: 4621 UNINET-AS-AP UNINET-, TH
203.9.156.0/24 Origin: 1851 ADELAIDE-UNIVERSITY-AS-AP The University
203.9.156.0/24 Transit: 7575 AARNET-AS-AP Australian Academic and Res
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-add-IANA
Number of prefixes announced per prefix length (Global)
-------------------------------------------------------
/1:0 /2:0 /3:0 /4:0 /5:0 /6:0
/7:0 /8:0 /9:1 /10:1 /11:1 /12:10
/13:19 /14:33 /15:110 /16:1934 /17:407 /18:446
/19:554 /20:768 /21:783 /22:1367 /23:1445 /24:10223
/25:4 /26:1 /27:0 /28:1 /29:0 /30:0
/31:0 /32:0
Advertised prefixes smaller than registry allocations
-----------------------------------------------------
ASN No of nets Total ann. Description
36914 513 537 KENET-AS, KE
8895 106 109 ISU Internet Services Unit ISU, SA
2152 63 543 CENIC-2152, US
23024 38 99 OCDE, US
3267 35 79 NIKS, RU
28614 32 38 Fundacao Universidade Regional de Blumenau, BR
46115 32 35 LUTHER, US
32440 31 56 LONI, US
25977 30 44 HCCS, US
27609 29 45 USC-UNIVERSITY-HOSPITAL, US
Complete listing at https://bgp.nsrc.org/REN/CERNET/data-sXXas-nos
Number of /24s announced per /8 block (Global)
----------------------------------------------
1:2 5:16 8:2 12:2 14:93 23:8
24:3 31:1 35:10 37:9 38:11 40:1
41:218 42:5 44:4 45:46 46:4 47:1
49:6 50:2 52:1 59:18 61:3 62:8
63:32 64:42 65:5 66:42 67:39 68:11
69:17 70:2 71:1 72:8 74:54 76:34
77:9 78:3 79:9 80:13 81:24 82:6
83:8 84:8 85:51 86:5 87:1 89:10
91:41 92:2 93:14 94:2 95:2 96:5
97:1 98:2 102:1 103:358 104:79 108:8
109:5 111:20 113:1 114:24 116:9 117:61
118:33 119:8 121:18 122:8 123:8 125:5
128:58 129:42 130:99 131:63 132:67 133:156
134:106 136:200 137:100 138:10 139:11 140:31
141:4 142:26 143:25 144:26 145:2 146:138
147:27 148:41 149:11 150:69 151:11 152:138
153:15 154:39 155:84 156:128 157:26 158:28
159:20 160:34 161:16 162:21 163:63 164:12
165:43 167:29 168:103 169:7 170:19 171:1
172:2 173:5 175:16 177:4 179:12 180:15
181:1 182:12 184:2 185:47 186:3 187:25
188:14 189:3 190:17 191:13 192:1382 193:299
194:141 195:82 196:145 197:325 198:516 199:246
200:299 201:37 202:566 203:450 204:391 205:173
206:210 207:310 208:67 209:162 210:145 211:3
212:144 213:4 216:94 217:22 218:23 219:7
220:16 222:1
End of report
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